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</script> <ul class="top-level astro-3ii7xxms"> <li class="astro-3ii7xxms"> <details open class="astro-3ii7xxms"> <sl-sidebar-restore data-index="0"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <span class="group-label astro-3ii7xxms"> <span class="large astro-3ii7xxms">ISPmail for Debian 13</span> </span> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"><path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z"/></svg> </summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"> <a href="/ispmail-trixie/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Start here</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/upgrading/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Upgrading from Debian Bookworm</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/install-debian/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Installing Debian</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/install-the-software-packages/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Install software packages</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/virtual-domains/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Virtual domains</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/database/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Database setup</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/overview/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Big picture</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/dns-records/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">DNS records</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/tls-certificate/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">TLS certificate</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/postfix/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Postfix</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/dovecot/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Dovecot</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/lmtp/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">LMTP</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/webmail/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Webmail using Roundcube</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/relaying/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Sending / Relaying</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/imap/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">IMAP</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/managing-users-aliases-and-domains/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Managing users, aliases and domains</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/catching-spam-with-rspamd/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Catching spam with rspamd</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/anti-spoofing-dkim-spf/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Prevent spoofing using DKIM and SPF</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/catch-all/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Catch-all addresses</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/quotas/" aria-current="page" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Quotas</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/going-live/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Going live</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-trixie/automated-installation/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Automated installation</span> </a> </li> </ul> </details> </li><li class="astro-3ii7xxms"> <details open class="astro-3ii7xxms"> <sl-sidebar-restore data-index="1"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <span class="group-label astro-3ii7xxms"> <span class="large astro-3ii7xxms">ISPmail for Debian 12</span> </span> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"><path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z"/></svg> </summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Start here</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/whats-new/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">What&#39;s new</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/migrating-from-a-bullseye-to-a-bookworm-server/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Migrating from your old (Bullseye) server</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/big-picture/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">The big picture</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/types-of-email-domains/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Types of email domains</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/install-debian-bookworm-on-your-server/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Installing Debian</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/install-the-software-packages/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Install software packages</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/creating-a-tls-encryption-key-and-certificate/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">TLS certificate</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/prepare-the-database/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Preparing the database</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/making-postfix-get-its-information-from-the-mariadb-database/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Let Postfix access MariaDB</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/catchall-aliases/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Catch-all aliases</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/setting-up-dovecot/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Setting up Dovecot</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/let-postfix-send-emails-to-dovecot/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Let Postfix send emails to Dovecot</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/quotas/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Quotas</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/testing-imap/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Testing IMAP</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/webmail-using-roundcube/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Webmail using Roundcube</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/testing-email-delivery/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Testing email delivery</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/relaying-outgoing-emails-through-postfix/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Relaying outgoing emails through Postfix</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/catching-spam-with-rspamd/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Catching spam with rspamd</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/setting-dns-records/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Setting DNS records</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/prevent-spoofing-using-dkim/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Prevent spoofing using DKIM</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/managing-users-aliases-and-domains/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Managing users, aliases and domains</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/monitoring-and-backup/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Monitoring and Backup</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/automatic-installation-with-ansible/" aria-current="false" 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5.89-2.33.134 1.035.13 3.432-2.329 5.891l-6.71 6.71-3.561-3.56 6.71-6.711Zm-1.318 15.837-.776-3.873 4.14-4.14v4.639l-3.364 3.374Z" clip-rule="evenodd"/><path d="M9.318 18.345a.972.972 0 0 0-1.86-.561c-.482 1.435-1.687 2.204-2.934 2.619a8.22 8.22 0 0 1-1.23.302c.062-.365.157-.79.303-1.229.415-1.247 1.184-2.452 2.62-2.935a.971.971 0 1 0-.62-1.842c-.12.04-.236.084-.35.13-2.02.828-3.012 2.588-3.493 4.033a10.383 10.383 0 0 0-.51 2.845l-.001.016v.063c0 .536.434.972.97.972H2.24a7.21 7.21 0 0 0 .878-.065c.527-.063 1.248-.19 2.02-.447 1.445-.48 3.205-1.472 4.033-3.494a5.828 5.828 0 0 0 .147-.407Z"/></svg>Optional feature </p> <div class="starlight-aside__content"> <p>This feature is completely optional. If you are eager to get finished then skip this page and maybe come back later.</p> </div> </aside>
<aside aria-label="Potential breakage with virtual_aliases" class="starlight-aside starlight-aside--danger"> <p class="starlight-aside__title" aria-hidden="true"> <svg aria-hidden="true" class="starlight-aside__icon astro-c6vsoqas" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1em;"><path d="M12 7a1 1 0 0 0-1 1v4a1 1 0 0 0 2 0V8a1 1 0 0 0-1-1Zm0 8a1 1 0 1 0 0 2 1 1 0 0 0 0-2Zm9.71-7.44-5.27-5.27a1.05 1.05 0 0 0-.71-.29H8.27a1.05 1.05 0 0 0-.71.29L2.29 7.56a1.05 1.05 0 0 0-.29.71v7.46c.004.265.107.518.29.71l5.27 5.27c.192.183.445.286.71.29h7.46a1.05 1.05 0 0 0 .71-.29l5.27-5.27a1.05 1.05 0 0 0 .29-.71V8.27a1.05 1.05 0 0 0-.29-.71ZM20 15.31 15.31 20H8.69L4 15.31V8.69L8.69 4h6.62L20 8.69v6.62Z"/></svg>Potential breakage with virtual_aliases </p> <div class="starlight-aside__content"> <p>There is an unsolved issue with <code dir="auto">virtual_aliases</code> if one of the recipients is over quota. I am currently investigating
that. See <a href="https://workaround.org/ispmail-trixie/quotas/#comentario-e1cdd47e-fa21-4213-83c3-1eb4fbd030f5">Juliens
comment</a>.</p> </div> </aside>
<p>Quotas are size limits for users. You can make sure that users do not waste arbitrary amounts of disk space but are
forced to clean up old emails every now and then.</p>
<p>The magic happens in two places:</p>
<ol>
<li>Dovecot needs to keep track of the quota and how much the user has already used up of it.</li>
<li>Postfix needs to reject new emails if the users mailbox is over quota.</li>
</ol>
<div class="sl-heading-wrapper level-h2"><h2 id="dovecot">Dovecot</h2><a class="sl-anchor-link" href="#dovecot"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Dovecot”</span></a></div>
<div class="sl-heading-wrapper level-h3"><h3 id="enable-quota-service">Enable quota service</h3><a class="sl-anchor-link" href="#enable-quota-service"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Enable quota service”</span></a></div>
<p>As usual we need a new piece of configuration to enable the <em>quota</em> plugin and define how we want it to behave:</p>
<div class="expressive-code"><link rel="stylesheet" href="/_astro/ec.v4551.css"><script type="module" src="/_astro/ec.0vx5m.js"></script><figure class="frame is-terminal has-title not-content"><figcaption class="header"><span class="title">Run this on your server</span></figcaption><pre data-language="sh"><code><div class="ec-line"><div class="code"><span style="--0:#82AAFF;--1:#3B61B0">cat</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#7FDBCA;--1:#096E72">></span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">/etc/dovecot/conf.d/99-ispmail-quota.conf</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#7FDBCA;--1:#096E72">&#x3C;&#x3C;</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#D9F5DD;--1:#111111">'EOF'</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># Enable the quota plugin</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D">mail_plugins {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">quota = yes</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># Set global defaults. Keep this outside of a "quota {}" section so that it</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># can be overriden with data from the virtual_users table.</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># Allow 5 GB of space per default.</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D">quota_storage_size = 5G</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># It is important to allow it so that Postfix can deliver an email to</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># bring the user above 100% of quota usage. Otherwise you risk that the user</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># is at 99.99% of quota but the last email cannot be delivered and gets stuck</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># between Postfix and Dovecot. No email should be larger than this.</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D">quota_storage_grace = 50M</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># Define two warnings at 80% and 95% of quota usage.</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D">quota "User quota" {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D"># Set one warning level to 100%</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">warning warn-100 {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">quota_storage_percentage = 100</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">execute quota-warning {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">args = 100 %{user}</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D"># Set another warning level to 80% for early warnings</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">warning warn-80 {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">quota_storage_percentage = 80</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">execute quota-warning {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">args = 80 %{user}</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D"># User is no longer over quota</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">warning warn-under {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">quota_storage_percentage = 100</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">threshold = under</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">execute quota-warning {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">args = below %{user}</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># Define what happens if the user goes over quota. Point to a script that</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># creates a warning email to the user. The name "quota-warning" corresponds</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># to the "execute" statement in the warning definitions.</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D">service quota-warning {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">executable = script /usr/local/bin/ispmail-quota-warning.sh</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">unix_listener quota-warning {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">mode = 0660</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">user = vmail</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">group = vmail</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># Add a new service so that Postfix can check if a user is over quota.</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># It listens on TCP port 13373.</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D">service quota-status {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">executable = quota-status -p postfix</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">inet_listener quota-status {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">listen = 127.0.0.1</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">port = 13373</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">client_limit = 1</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># Enable the IMAP QUOTA extension, allowing IMAP clients to ask for the</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># current quota usage. Roundcube displays the current space usage in</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D"># the lower left corner.</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D">protocol imap {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">mail_plugins {</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">imap_quota = yes</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#ECC48D;--1:#984E4D"> </span></span><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code"><span style="--0:#ECC48D;--1:#984E4D">}</span></div></div><div class="ec-line"><div class="code"><span style="--0:#D9F5DD;--1:#111111">EOF</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#919F9F;--1:#5F636F"># Apply the configuration</span></div></div><div class="ec-line"><div class="code"><span style="--0:#82AAFF;--1:#3B61B0">systemctl</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">reload</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">dovecot</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="cat > /etc/dovecot/conf.d/99-ispmail-quota.conf << &#x27;EOF&#x27;# Enable the quota pluginmail_plugins { quota = yes}# Set global defaults. Keep this outside of a &#x22;quota {}&#x22; section so that it# can be overriden with data from the virtual_users table.# Allow 5 GB of space per default.quota_storage_size = 5G# It is important to allow it so that Postfix can deliver an email to# bring the user above 100% of quota usage. Otherwise you risk that the user# is at 99.99% of quota but the last email cannot be delivered and gets stuck# between Postfix and Dovecot. No email should be larger than this.quota_storage_grace = 50M# Define two warnings at 80% and 95% of quota usage.quota &#x22;User quota&#x22; { # Set one warning level to 100% warning warn-100 { quota_storage_percentage = 100 execute quota-warning { args = 100 %{user} } } # Set another warning level to 80% for early warnings warning warn-80 { quota_storage_percentage = 80 execute quota-warning { args = 80 %{user} } } # User is no longer over quota warning warn-under { quota_storage_percentage = 100 threshold = under execute quota-warning { args = below %{user} } }}# Define what happens if the user goes over quota. Point to a script that# creates a warning email to the user. The name &#x22;quota-warning&#x22; corresponds# to the &#x22;execute&#x22; statement in the warning definitions.service quota-warning { executable = script /usr/local/bin/ispmail-quota-warning.sh unix_listener quota-warning { mode = 0660 user = vmail group = vmail }}# Add a new service so that Postfix can check if a user is over quota.# It listens on TCP port 13373.service quota-status { executable = quota-status -p postfix inet_listener quota-status { listen = 127.0.0.1 port = 13373 } client_limit = 1}# Enable the IMAP QUOTA extension, allowing IMAP clients to ask for the# current quota usage. Roundcube displays the current space usage in# the lower left corner.protocol imap { mail_plugins { imap_quota = yes }}EOF# Apply the configurationsystemctl reload dovecot"><div></div></button></div></figure></div>
<p>The script that is launched by the <code dir="auto">quota-warning</code> service is pretty simple. It sends an email to the affected user. It
uses the special way of <code dir="auto">dovecot-lda -o quota_enforce=no</code> though so that the warning email itself is always delivered
even if the user is over quota.</p>
<div class="expressive-code"><figure class="frame has-title not-content"><figcaption class="header"><span class="title">Run this on your server</span></figcaption><pre data-language="sh"><code><div class="ec-line"><div class="code"><span style="--0:#82AAFF;--1:#3B61B0">cat</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#7FDBCA;--1:#096E72">></span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">/usr/local/bin/ispmail-quota-warning.sh</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">&#x3C;</span><span style="--0:#7FDBCA;--1:#096E72">&#x3C;</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#D9F5DD;--1:#111111">'</span><span style="--0:#ECC48D;--1:#984E4D">EOF</span><span style="--0:#D9F5DD;--1:#111111">'</span></div></div><div class="ec-line"><div class="code"><span style="--0:#919F9F;--1:#5F636F">#!/bin/bash</span></div></div><div class="ec-line"><div class="code"><span style="--0:#919F9F;--1:#5F636F">#</span></div></div><div class="ec-line"><div class="code"><span style="--0:#919F9F;--1:#5F636F"># This script is part of the ISPmail configuration.</span></div></div><div class="ec-line"><div class="code"><span style="--0:#919F9F;--1:#5F636F"># It is called from /etc/dovecot/conf.d/99-ispmail-quota.conf</span></div></div><div class="ec-line"><div class="code"><span style="--0:#919F9F;--1:#5F636F"># and sends an email to the user if the quota is at 80%, over 100%</span></div></div><div class="ec-line"><div class="code"><span style="--0:#919F9F;--1:#5F636F"># or back below 100%.</span></div></div><div class="ec-line"><div class="code"><span style="--0:#919F9F;--1:#5F636F">#</span></div></div><div class="ec-line"><div class="code"><span style="--0:#919F9F;--1:#5F636F"># Christoph Haas &#x3C;ispmail@christoph-haas.de></span></div></div><div class="ec-line"><div class="code"><span style="--0:#919F9F;--1:#5F636F"># Version 1.0 2025-12-30</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#C5E478;--1:#3B61B0">LEVEL</span><span style="--0:#C792EA;--1:#8844AE">=</span><span style="--0:#D7DBE0;--1:#403F53">$1</span></div></div><div class="ec-line"><div class="code"><span style="--0:#C5E478;--1:#3B61B0">USER</span><span style="--0:#C792EA;--1:#8844AE">=</span><span style="--0:#D7DBE0;--1:#403F53">$2</span></div></div><div class="ec-line"><div class="code"><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">From: postmaster@${</span><span style="--0:#C5E478;--1:#3B61B0">USER</span><span style="--0:#7FDBCA;--1:#096E72">#*@</span><span style="--0:#ECC48D;--1:#984E4D">}</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\nSubject: Quota information</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\nX-Priority: 1</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\n\nThis is an automatic email from your friendly mail server.\n\n</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#C792EA;--1:#8844AE">if</span><span style="--0:#D6DEEB;--1:#403F53"> [ </span><span style="--0:#C5E478;--1:#3B61B0">$LEVEL</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#C792EA;--1:#8844AE">=</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">below</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#D6DEEB;--1:#403F53"> ]; </span><span style="--0:#C792EA;--1:#8844AE">then</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">Thanks for making some space. You will now be able to receive emails again.</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span style="--0:#C792EA;--1:#8844AE">elif</span><span style="--0:#D6DEEB;--1:#403F53"> [ </span><span style="--0:#C5E478;--1:#3B61B0">$LEVEL</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#C792EA;--1:#8844AE">-eq</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#F78C6C;--1:#AA0982">80</span><span style="--0:#D6DEEB;--1:#403F53"> ]; </span><span style="--0:#C792EA;--1:#8844AE">then</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">Your mailbox is currently using up 80% of the maximum space.</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\nPlease consider deleting some emails. If your used space reached</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\n100% then you would not be able to receive further emails. I will</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\nhowever send you another email in that case.</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\n</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\nThanks for your attention.</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span style="--0:#C792EA;--1:#8844AE">elif</span><span style="--0:#D6DEEB;--1:#403F53"> [ </span><span style="--0:#C5E478;--1:#3B61B0">$LEVEL</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#C792EA;--1:#8844AE">-eq</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#F78C6C;--1:#AA0982">100</span><span style="--0:#D6DEEB;--1:#403F53"> ]; </span><span style="--0:#C792EA;--1:#8844AE">then</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">I am afraid to tell you that your mailbox is now 100% full.</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\nNew emails to your address will be rejected by the server.</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\nPlease delete some emails immediately. I will send you another</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\nemail once you have made some space.</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\n</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#C5E478;--1:#3B61B0">MAIL</span><span style="--0:#C792EA;--1:#8844AE">+=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">\nThanks for your attention.</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div><div class="ec-line"><div class="code"><span style="--0:#C792EA;--1:#8844AE">fi</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#C5E478;--1:#3B61B0">echo</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#82AAFF;--1:#3B61B0">-e</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#C5E478;--1:#3B61B0">$MAIL</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#7FDBCA;--1:#096E72">|</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#82AAFF;--1:#3B61B0">/usr/lib/dovecot/dovecot-lda</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#82AAFF;--1:#3B61B0">-d</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#C5E478;--1:#3B61B0">$USER</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#82AAFF;--1:#3B61B0">-o</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">quota_enforce=no</span></div></div><div class="ec-line"><div class="code"><span style="--0:#82AAFF;--1:#3B61B0">EOF</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#82AAFF;--1:#3B61B0">chmod</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">u=rwx,g=rx,o=</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">/usr/local/bin/ispmail-quota-warning.sh</span></div></div><div class="ec-line"><div class="code"><span style="--0:#82AAFF;--1:#3B61B0">chown</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">vmail:vmail</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">/usr/local/bin/ispmail-quota-warning.sh</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="cat > /usr/local/bin/ispmail-quota-warning.sh << &#x27;EOF&#x27;#!/bin/bash## This script is part of the ISPmail configuration.# It is called from /etc/dovecot/conf.d/99-ispmail-quota.conf# and sends an email to the user if the quota is at 80%, over 100%# or back below 100%.## Christoph Haas <ispmail@christoph-haas.de># Version 1.0 2025-12-30LEVEL=$1USER=$2MAIL=&#x22;From: postmaster@${USER#*@}&#x22;MAIL+=&#x22;\nSubject: Quota information&#x22;MAIL+=&#x22;\nX-Priority: 1&#x22;MAIL+=&#x22;\n\nThis is an automatic email from your friendly mail server.\n\n&#x22;if [ $LEVEL = &#x22;below&#x22; ]; then MAIL+=&#x22;Thanks for making some space. You will now be able to receive emails again.&#x22;elif [ $LEVEL -eq 80 ]; then MAIL+=&#x22;Your mailbox is currently using up 80% of the maximum space.&#x22; MAIL+=&#x22;\nPlease consider deleting some emails. If your used space reached&#x22; MAIL+=&#x22;\n100% then you would not be able to receive further emails. I will&#x22; MAIL+=&#x22;\nhowever send you another email in that case.&#x22; MAIL+=&#x22;\n&#x22; MAIL+=&#x22;\nThanks for your attention.&#x22;elif [ $LEVEL -eq 100 ]; then MAIL+=&#x22;I am afraid to tell you that your mailbox is now 100% full.&#x22; MAIL+=&#x22;\nNew emails to your address will be rejected by the server.&#x22; MAIL+=&#x22;\nPlease delete some emails immediately. I will send you another&#x22; MAIL+=&#x22;\nemail once you have made some space.&#x22; MAIL+=&#x22;\n&#x22; MAIL+=&#x22;\nThanks for your attention.&#x22;fiecho -e $MAIL | /usr/lib/dovecot/dovecot-lda -d $USER -o quota_enforce=noEOFchmod u=rwx,g=rx,o= /usr/local/bin/ispmail-quota-warning.shchown vmail:vmail /usr/local/bin/ispmail-quota-warning.sh"><div></div></button></div></figure></div>
<div class="sl-heading-wrapper level-h3"><h3 id="global-versus-local">Global versus local</h3><a class="sl-anchor-link" href="#global-versus-local"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Global versus local”</span></a></div>
<p>By default you will probably allow all users to use a certain amount of disk space for their emails. That would be the
global value that you set using <code dir="auto">quota_storage_size = …</code>.</p>
<p>But maybe you have some special users that need a different value. For a power user you could allow more space than for
other users. Then set the <code dir="auto">quota</code> field in his record in the <code dir="auto">virtual_users</code> table to a value larger than 0.</p>
<p>So the logic for the <code dir="auto">quota</code> field in the database is:</p>
<ul>
<li><strong>0</strong> means: take the global setting of <code dir="auto">quota_storage_size</code></li>
<li><strong>anything else</strong>: override by this value (in bytes)</li>
</ul>
<p>We added that logic into the <code dir="auto">userdb sql</code> section earlier:</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="sql"><code><div class="ec-line"><div class="code"><span style="--0:#C792EA;--1:#8844AE">IF</span><span style="--0:#D6DEEB;--1:#403F53">(quota </span><span style="--0:#C792EA;--1:#8844AE">></span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#F78C6C;--1:#AA0982">0</span><span style="--0:#D6DEEB;--1:#403F53">, </span><span style="--0:#C5E478;--1:#3B61B0">CONCAT</span><span style="--0:#D6DEEB;--1:#403F53">(quota, </span><span style="--0:#D9F5DD;--1:#111111">'</span><span style="--0:#ECC48D;--1:#984E4D">B</span><span style="--0:#D9F5DD;--1:#111111">'</span><span style="--0:#D6DEEB;--1:#403F53">), </span><span style="--0:#C792EA;--1:#8844AE">NULL</span><span style="--0:#D6DEEB;--1:#403F53">) </span><span style="--0:#C792EA;--1:#8844AE">AS</span><span style="--0:#D6DEEB;--1:#403F53"> quota_storage_size</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="IF(quota > 0, CONCAT(quota, &#x27;B&#x27;), NULL) AS quota_storage_size"><div></div></button></div></figure></div>
<p>Thats the SQL way of saying: if “quota” is 0, then return NULL. NULL tells Dovecot to fall back to the global value.
Otherwise add a “B” (for “bytes” Dovecot requires that) and return that.</p>
<div class="sl-heading-wrapper level-h3"><h3 id="showing-current-usage">Showing current usage</h3><a class="sl-anchor-link" href="#showing-current-usage"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Showing current usage”</span></a></div>
<p>Now that quota restrictions are in place, you can ask Dovecot for the current status of all mailboxes:</p>
<div class="expressive-code"><figure class="frame is-terminal has-title not-content"><figcaption class="header"><span class="title">Run this on your server</span></figcaption><pre data-language="sh"><code><div class="ec-line"><div class="code"><span style="--0:#82AAFF;--1:#3B61B0">doveadm</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">quota</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">get</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#82AAFF;--1:#3B61B0">-A</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="doveadm quota get -A"><div></div></button></div></figure></div>
<p>You will get output like this:</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="plaintext"><code><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">Username Quota name Type Value Limit %</span></div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">john@example.org User quota STORAGE 22856 1048576 2</span></div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">john@example.org User quota MESSAGE 19 - 0</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="Username Quota name Type Value Limit %john@example.org User quota STORAGE 22856 1048576 2john@example.org User quota MESSAGE 19 - 0"><div></div></button></div></figure></div>
<p>John is shown twice because Dovecot keeps track of:</p>
<ul>
<li>the <strong>amount of storage</strong> John uses (<code dir="auto">STORAGE</code>)</li>
<li>the <strong>number of emails</strong> that John has (<code dir="auto">MESSAGE</code>)</li>
</ul>
<p>The current configuration just cares about the space that is used on disk. So in the above example he has 22,856 KB used
of the 1 GB limit which is 2%. And he has a total of 19 messages but there is no limit to that.</p>
<div class="sl-heading-wrapper level-h3"><h3 id="testing-the-quota-service-optional">Testing the quota service (optional)</h3><a class="sl-anchor-link" href="#testing-the-quota-service-optional"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Testing the quota service (optional)”</span></a></div>
<p>You may wonder why there is a <code dir="auto">quota-status</code> service. If a user is over quota then it would reject an more incoming
emails. But Postfix which sits in front front of Dovecot would still happily accept more emails. For a sender on a
remote server it looks like the email was delivered. But its now stuck between Postfix and Dovecot until the user makes
some space.</p>
<p>The obvious solution: Postfix needs to know if a user is over quota so that it can reject further emails. Thats the
purpose of the <code dir="auto">quota-status</code> service which is now listening on TCP port 13373 (on the <em>local</em> interface) for such
queries. The protocol is very simple and you can even play with it as a human:</p>
<div class="expressive-code"><figure class="frame is-terminal not-content"><figcaption class="header"><span class="title"></span><span class="sr-only">Terminal window</span></figcaption><pre data-language="sh"><code><div class="ec-line"><div class="code"><span style="--0:#C5E478;--1:#3B61B0">echo</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#82AAFF;--1:#3B61B0">-e</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">recipient=john@example.org\n</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#7FDBCA;--1:#096E72">|</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#82AAFF;--1:#3B61B0">nc</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">localhost</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#F78C6C;--1:#AA0982">13373</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="echo -e &#x22;recipient=john@example.org\n&#x22; | nc localhost 13373"><div></div></button></div></figure></div>
<p>And the service will respond with:</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="plaintext"><code><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">action=OK</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="action=OK"><div></div></button></div></figure></div>
<p>The response tells you whether the user is over quota:</p>
<ul>
<li><code dir="auto">action=OK</code> or</li>
<li><code dir="auto">action=554 5.2.2 Quota exceeded (mailbox for user is full)</code></li>
</ul>
<div class="sl-heading-wrapper level-h2"><h2 id="postfix">Postfix</h2><a class="sl-anchor-link" href="#postfix"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Postfix”</span></a></div>
<p>Telling Postfix to use the <code dir="auto">quota-status</code> service is suprisingly simple:</p>
<div class="expressive-code"><figure class="frame is-terminal has-title not-content"><figcaption class="header"><span class="title">Run this on your server</span></figcaption><pre data-language="sh"><code><div class="ec-line"><div class="code"><span style="--0:#82AAFF;--1:#3B61B0">postconf</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">smtpd_recipient_restrictions=</span><span style="--0:#D9F5DD;--1:#111111">"</span><span style="--0:#ECC48D;--1:#984E4D">check_policy_service inet:localhost:13373</span><span style="--0:#D9F5DD;--1:#111111">"</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="postconf smtpd_recipient_restrictions=&#x22;check_policy_service inet:localhost:13373&#x22;"><div></div></button></div></figure></div>
<hr>
<div class="sl-heading-wrapper level-h3"><h3 id="test-it">Test it</h3><a class="sl-anchor-link" href="#test-it"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Test it”</span></a></div>
<p>If you are curious to see this working, then set Johns mailbox quota to 5 KB:</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="sql"><code><div class="ec-line"><div class="code"><span style="--0:#D6DEEB;--1:#403F53"># mariadb mailserver</span></div></div><div class="ec-line"><div class="code"><span style="--0:#D6DEEB;--1:#403F53">mysql</span><span style="--0:#C792EA;--1:#8844AE">></span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#C792EA;--1:#8844AE">update</span><span style="--0:#D6DEEB;--1:#403F53"> virtual_users </span><span style="--0:#C792EA;--1:#8844AE">set</span><span style="--0:#D6DEEB;--1:#403F53"> quota</span><span style="--0:#C792EA;--1:#8844AE">=</span><span style="--0:#F78C6C;--1:#AA0982">5120</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#C792EA;--1:#8844AE">where</span><span style="--0:#D6DEEB;--1:#403F53"> email</span><span style="--0:#C792EA;--1:#8844AE">=</span><span style="--0:#D9F5DD;--1:#111111">'</span><span style="--0:#ECC48D;--1:#984E4D">john@example.org</span><span style="--0:#D9F5DD;--1:#111111">'</span><span style="--0:#D6DEEB;--1:#403F53">;</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="# mariadb mailservermysql> update virtual_users set quota=5120 where email=&#x27;john@example.org&#x27;;"><div></div></button></div></figure></div>
<p>Verify that he now has a limit of 5 KB:</p>
<div class="expressive-code"><figure class="frame is-terminal not-content"><figcaption class="header"><span class="title"></span><span class="sr-only">Terminal window</span></figcaption><pre data-language="sh"><code><div class="ec-line"><div class="code"><span style="--0:#82AAFF;--1:#3B61B0">doveadm</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">quota</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">get</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#82AAFF;--1:#3B61B0">-u</span><span style="--0:#D6DEEB;--1:#403F53"> </span><span style="--0:#ECC48D;--1:#3B61B0">john@example.org</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="doveadm quota get -u john@example.org"><div></div></button></div></figure></div>
<p>Send him a few emails using the swaks tool:</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="plaintext"><code><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">swaks --server localhost --to john@example.org -tls</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="swaks --server localhost --to john@example.org -tls"><div></div></button></div></figure></div>
<p>After a few emails you will see the rejection message:</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="plaintext"><code><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">-> RCPT TO:john@example.org</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#d6deeb;--1:#403f53"> </span></span><span style="--0:#d6deeb;--1:#403f53">&#x3C;** 452 4.2.2 john@example.org: Recipient address rejected: Mailbox is full and cannot receive any more emails</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="-> RCPT TO:john@example.org <** 452 4.2.2 john@example.org: Recipient address rejected: Mailbox is full and cannot receive any more emails"><div></div></button></div></figure></div>
<div class="sl-heading-wrapper level-h3"><h3 id="troubleshooting">Troubleshooting</h3><a class="sl-anchor-link" href="#troubleshooting"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Troubleshooting”</span></a></div>
<p>These are things you should consider if quotas do not seem to work properly:</p>
<ul>
<li>Check that your <code dir="auto">/etc/dovecot/conf.d/99-ispmail-sql.conf</code> file looks as
<a href="/ispmail-trixie/dovecot#99-ispmail-sqlconf">described</a>. Earlier version of this Trixie guide did not contain the
<code dir="auto">quota_storage_size</code> field in the <code dir="auto">userdb sql</code> query.</li>
<li>Run <code dir="auto">tcpdump -Ai lo port 13373</code> on the server to see if Postfix talks to the <code dir="auto">quota-status</code> service.</li>
<li>Your users may complain that they have deleted many emails but are still over quota. Let them check if they actually
emptied the <em>Trash</em> folder. Of course emails in that folder also contribute to the disk space usage. Once the Trash
folder is expunged the problem should be gone. You may also allow your users more space in the Trash folder. Thats
explained in the <a href="https://doc.dovecot.org/configuration_manual/quota/#quota-rules">Dovecot documentation</a>.</li>
<li>If you directly remove files from a users Maildir instead of properly accessing the mailbox using IMAP then you will
screw up the quota calculation. In that case let Dovecot recalculate the quota:<br>
<code dir="auto">doveadm quota recalc -u john@example.org</code></li>
</ul>
<div class="sl-heading-wrapper level-h3"><h3 id="see-also">See also</h3><a class="sl-anchor-link" href="#see-also"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “See also”</span></a></div>
<ul>
<li><a href="https://doc.dovecot.org/2.4.2/core/plugins/quota.html#quota-service">https://doc.dovecot.org/2.4.2/core/plugins/quota.html#quota-service</a></li>
<li><a href="https://sys4.de/en/blog/postfix-dovecot-mailbox-quota/">https://sys4.de/en/blog/postfix-dovecot-mailbox-quota/</a></li>
<li><a href="https://www.postfix.org/SMTPD_POLICY_README.html">https://www.postfix.org/SMTPD_POLICY_README.html</a></li>
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