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77 KiB
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188 lines
No EOL
77 KiB
HTML
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</style><script type="module" src="/_astro/page.B1D-nYk3.js"></script></head> <body class="astro-bguv2lll"> <a href="#_top" class="astro-7q3lir66">Skip to content</a> <div class="page sl-flex astro-vrdttmbt"> <header class="header astro-vrdttmbt"><div class="header astro-kmkmnagf"> <div class="title-wrapper sl-flex astro-kmkmnagf"> <a href="/" class="site-title sl-flex astro-m46x6ez3"> <img class="light:sl-hidden print:hidden astro-m46x6ez3" alt src="/_astro/logo-dark.DlBk_-6-.svg" width="146" height="37"> <img class="dark:sl-hidden print:block astro-m46x6ez3" alt src="/_astro/logo.DfR9nmxN.svg" width="146" height="37"> <span class="sr-only astro-m46x6ez3" translate="no"> ISPmail Guide </span> </a> </div> <div class="sl-flex print:hidden astro-kmkmnagf"> <site-search class="astro-kmkmnagf astro-v37mnknz" data-translations="{"placeholder":"Search"}"> <button data-open-modal disabled aria-label="Search" aria-keyshortcuts="Control+K" class="astro-v37mnknz"> <svg aria-hidden="true" class="astro-v37mnknz astro-c6vsoqas" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1em;"><path d="M21.71 20.29 18 16.61A9 9 0 1 0 16.61 18l3.68 3.68a.999.999 0 0 0 1.42 0 1 1 0 0 0 0-1.39ZM11 18a7 7 0 1 1 0-14 7 7 0 0 1 0 14Z"/></svg> <span class="sl-hidden md:sl-block astro-v37mnknz" aria-hidden="true">Search</span> <kbd class="sl-hidden md:sl-flex astro-v37mnknz" style="display: none;"> <kbd class="astro-v37mnknz">Ctrl</kbd><kbd class="astro-v37mnknz">K</kbd> </kbd> </button> <dialog style="padding:0" aria-label="Search" class="astro-v37mnknz"> <div class="dialog-frame sl-flex astro-v37mnknz"> <button data-close-modal class="sl-flex md:sl-hidden astro-v37mnknz"> Cancel </button> <div class="search-container astro-v37mnknz"> <div id="starlight__search" class="astro-v37mnknz"></div> </div> </div> </dialog> </site-search> <script>
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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="false" 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'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="page" 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" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Automatic installation with Ansible</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/success-stories/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Success stories</span> </a> </li><li class="astro-3ii7xxms"> <a href="/ispmail-bookworm/faq-frequently-asked-questions/" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">FAQ (frequently asked questions)</span> </a> </li> </ul> </details> </li><li class="astro-3ii7xxms"> <details open class="astro-3ii7xxms"> <sl-sidebar-restore data-index="2"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <span class="group-label astro-3ii7xxms"> <span class="large astro-3ii7xxms">Misc articles</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 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1;">Automatic warning emails</span> </a> </li> </ul> </li> </ul> </nav></starlight-toc><script type="module" src="/_astro/TableOfContents.astro_astro_type_script_index_0_lang.CKWWgpjV.js"></script></div></div> </div> </aside> <div class="main-pane astro-67yu43on"> <main data-pagefind-body class="astro-bguv2lll" lang="en" dir="ltr"> <section style="background-color: #ffefef; padding: 1rem; border: 1px solid #f00; text-align: center;" class="astro-kggsjsm4">
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⚠️ This page is part of the ISPmail guide for Debian Bookworm. Please use the newer guide for <a href="/ispmail-trixie/" class="astro-kggsjsm4">Debian Trixie</a>.
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</section> <div class="content-panel astro-7nkwcw3z"> <div class="sl-container astro-7nkwcw3z"> <h1 id="_top" class="astro-j6tvhyss">Quotas</h1> </div> </div> <div class="content-panel astro-7nkwcw3z"> <div class="sl-container astro-7nkwcw3z"> <div class="sl-markdown-content"> <aside aria-label="Optional feature" class="starlight-aside starlight-aside--tip"> <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 fill-rule="evenodd" d="M1.44 8.855v-.001l3.527-3.516c.34-.344.802-.541 1.285-.548h6.649l.947-.947c3.07-3.07 6.207-3.072 7.62-2.868a1.821 1.821 0 0 1 1.557 1.557c.204 1.413.203 4.55-2.868 7.62l-.946.946v6.649a1.845 1.845 0 0 1-.549 1.286l-3.516 3.528a1.844 1.844 0 0 1-3.11-.944l-.858-4.275-4.52-4.52-2.31-.463-1.964-.394A1.847 1.847 0 0 1 .98 10.693a1.843 1.843 0 0 1 .46-1.838Zm5.379 2.017-3.873-.776L6.32 6.733h4.638l-4.14 4.14Zm8.403-5.655c2.459-2.46 4.856-2.463 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>
|
||
<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>Postfix needs to reject new emails if the user’s mailbox is over quota.</li>
|
||
<li>Dovecot needs to keep track of the quota and how much the user has already used up of it.</li>
|
||
</ol>
|
||
<div class="sl-heading-wrapper level-h3"><h3 id="dovecot-quota-policy-service">Dovecot quota policy service</h3><a class="sl-anchor-link" href="#dovecot-quota-policy-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 “Dovecot quota policy service”</span></a></div>
|
||
<p>Let’s start with Dovecot. Find the file <code dir="auto">/etc/dovecot/conf.d/90-quota.conf</code> and edit it. There are several <code dir="auto">plugin {}</code>
|
||
sections. Take one and make it look like:</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 not-content"><figcaption class="header"></figcaption><pre data-language="plaintext"><code><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">plugin {</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">quota = count:User quota</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">quota_vsizes = yes</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:#d6deeb;--1:#403f53"> </span></span><span style="--0:#d6deeb;--1:#403f53">quota_status_success = DUNNO</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">quota_status_nouser = DUNNO</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">quota_status_overquota = "452 4.2.2 Mailbox is full and cannot receive any more emails"</span></div></div><div class="ec-line"><div class="code"><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="plugin { quota = count:User quota quota_vsizes = yes quota_status_success = DUNNO quota_status_nouser = DUNNO quota_status_overquota = "452 4.2.2 Mailbox is full and cannot receive any more emails"}"><div></div></button></div></figure></div>
|
||
<p>The first line defines that you want to calculate the used space in a user’s <em>maildir</em>. There are several
|
||
<a href="https://doc.dovecot.org/configuration_manual/quota_plugin/">backends</a> like that but the
|
||
<em><a href="https://doc.dovecot.org/configuration_manual/quota/quota_count/#quota-backend-count">count</a></em> is the best choice in
|
||
this context. (Previous guides used <em>maildir</em> here.) The string “User quota” is just an arbitrary string that may be
|
||
queried from a mail user agent.</p>
|
||
<p>The lines starting with “<code dir="auto">quota_status_…</code>” set return values for the service that you will set up in a minute. It will
|
||
tell Postfix that it will not interfere (<em>DUNNO</em> – colloquial way to say “I don’t know”). And it will return a string
|
||
with a return code 452 if the user is over quota. Codes starting with “4” mean temporary errors. It will tell the
|
||
sending party that it is worth retrying at a later time. However if the user does not resolve the issue it will lead to
|
||
a <em>bounce</em> error email after three days.</p>
|
||
<p>In the same file (<em>90-quota.conf</em>) add another section:</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">service quota-status {</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">executable = /usr/lib/dovecot/quota-status -p postfix</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">unix_listener /var/spool/postfix/private/quota-status {</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">user = postfix</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">}</span></div></div><div class="ec-line"><div class="code"><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="service quota-status { executable = /usr/lib/dovecot/quota-status -p postfix unix_listener /var/spool/postfix/private/quota-status { user = postfix }}"><div></div></button></div></figure></div>
|
||
<p>This creates a new <a href="https://doc.dovecot.org/configuration_manual/service_configuration/">Dovecot service</a> responding to
|
||
requests from other processes. You surely recognize that we put it into the jail that Postfix runs in
|
||
(<em>/var/spool/postfix</em>), so that Postfix can access it.</p>
|
||
<p>Time to restart Dovecot:</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">systemctl restart dovecot</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="systemctl restart dovecot"><div></div></button></div></figure></div>
|
||
<p>Take a look at the /var/spool/postfix/private directory. If all went as intended you will find a socket file called
|
||
<code dir="auto">quota-status</code> there. Otherwise please check the <code dir="auto">/var/log/mail.log</code> file for errors.</p>
|
||
<div class="sl-heading-wrapper level-h3"><h3 id="postfix-recipient-restrictions">Postfix recipient restrictions</h3><a class="sl-anchor-link" href="#postfix-recipient-restrictions"><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 recipient restrictions”</span></a></div>
|
||
<p>If we stopped here, then Dovecot would reject emails for users who have no space left. However Postfix would still
|
||
happily receive new emails and attempt to forward them to Dovecot via LMTP. Dovecot however will deny that. It will then
|
||
keep the email in its queue and retry for a while. In the end it will send a <em>bounce</em> back to the sender telling them
|
||
about the problem. So why is this bad?</p>
|
||
<ol>
|
||
<li>The sender will assume that the email was delivered while it is stuck in the queue for up to three days.</li>
|
||
<li>Spam emails use forged senders. So at the time that Postfix generates the <em>bounce email</em> it will likely send it to an
|
||
innocent person. This is called <em>backscatter</em> and considered a mail server misconfiguration. Such a problem may get
|
||
your mail server blacklisted. You don’t want that.</li>
|
||
</ol>
|
||
<p>So the next logical step is to make Postfix check whether a mailbox is over quota whenever a new email arrives. Let’s
|
||
hook up into the “RCPT TO” phase of the SMTP dialog when a new email comes in. Postfix checks its
|
||
<em>smtpd_recipient_restrictions</em> configuration at this stage. Run this command in the shell:</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">postconf smtpd_recipient_restrictions=reject_unauth_destination, \</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">"check_policy_service unix:private/quota-status"</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=reject_unauth_destination, \ "check_policy_service unix:private/quota-status""><div></div></button></div></figure></div>
|
||
<p>This adds two checks:</p>
|
||
<ol>
|
||
<li><code dir="auto">reject_unauth_destination</code> checks whether the mail server is the final destination for the recipient’s email
|
||
address. This is pretty much the default behavior if you do not define any restrictions.</li>
|
||
<li><code dir="auto">check_policy_service</code> connects to the socket file at <code dir="auto">/var/spool/postfix/private/quota-status</code> that was put there by
|
||
Dovecot. It will use it to ask Dovecot whether the user is over quota in which case the email would get rejected.</li>
|
||
</ol>
|
||
<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 John’s 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">4000</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=4000 where email='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</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"><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"><** 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 if you have enabled “quota” in the “mail_plugins” in the 10-mail.conf file.</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. That’s
|
||
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 user’s 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="automatic-warning-emails">Automatic warning emails</h3><a class="sl-anchor-link" href="#automatic-warning-emails"><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 “Automatic warning emails”</span></a></div>
|
||
<p>The last step is to inform the poor users if they accidentally went over quota. After all they do not necessarily
|
||
recognize that on their own. Let’s do that by sending them an email with a warning. Yes, we will make sure that the
|
||
email gets through even if the quota is reached.</p>
|
||
<p>Edit the <code dir="auto">90-quota.conf</code> file again. Add this section to the file (derived from the
|
||
<a href="https://doc.dovecot.org/configuration_manual/quota/#quota-warning-scripts">Dovecot documentation</a>):</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">plugin {</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">quota_warning = storage=95%% quota-warning 95 %u</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">quota_warning2 = storage=80%% quota-warning 80 %u</span></div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">}</span></div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">service quota-warning {</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">executable = script /usr/local/bin/quota-warning.sh</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">unix_listener quota-warning {</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">user = vmail</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">group = vmail</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">mode = 0660</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">}</span></div></div><div class="ec-line"><div class="code"><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="plugin { quota_warning = storage=95%% quota-warning 95 %u quota_warning2 = storage=80%% quota-warning 80 %u}service quota-warning { executable = script /usr/local/bin/quota-warning.sh unix_listener quota-warning { user = vmail group = vmail mode = 0660 }}"><div></div></button></div></figure></div>
|
||
<p>This section defines two automatic quota warnings. The first (quota_warning) is triggered if the user reaches 95% of the
|
||
quota. The second (quota_warning2) at 80%. These lines follow this schema:</p>
|
||
<ul>
|
||
<li><strong>Trigger</strong> (e.g. “storage=95%”). The “%” sign needs to be used twice if you want to emit a literal percent sign. So
|
||
this is not a typo.</li>
|
||
<li>The <strong>socket</strong> you want to call in that case. Our socket is the “service quota-warning” that calls a shell script.</li>
|
||
<li>Additional <strong>parameters</strong> that are passed to the shell script in our case. They tell the script the percentage that
|
||
has been reached (e.g. 95) and the address of the user who should get the warning.</li>
|
||
</ul>
|
||
<p>Apparently we need the script to run. So please create a new file at <code dir="auto">/usr/local/bin/quota-warning.sh</code> and put these
|
||
lines into it:</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">#!/bin/sh</span></div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">PERCENT=$1</span></div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">USER=$2</span></div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">cat << EOF | /usr/lib/dovecot/dovecot-lda -d $USER -o "plugin/quota=maildir:User quota:noenforcing"</span></div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">From: postmaster@webmail.example.org</span></div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">Subject: Quota warning - $PERCENT% reached</span></div></div><div class="ec-line"><div class="code">
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</div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">Your mailbox can only store a limited amount of emails.</span></div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">Currently it is $PERCENT% full. If you reach 100% then</span></div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">new emails cannot be stored. Thanks for your understanding.</span></div></div><div class="ec-line"><div class="code"><span style="--0:#d6deeb;--1:#403f53">EOF</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="#!/bin/shPERCENT=$1USER=$2cat << EOF | /usr/lib/dovecot/dovecot-lda -d $USER -o "plugin/quota=maildir:User quota:noenforcing"From: postmaster@webmail.example.orgSubject: Quota warning - $PERCENT% reachedYour mailbox can only store a limited amount of emails.Currently it is $PERCENT% full. If you reach 100% thennew emails cannot be stored. Thanks for your understanding.EOF"><div></div></button></div></figure></div>
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<p>Make this file executable:</p>
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<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">chmod +x /usr/local/bin/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="chmod +x /usr/local/bin/quota-warning.sh"><div></div></button></div></figure></div>
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<p>Time to restart Dovecot again:</p>
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<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">systemctl restart dovecot</span></div></div></code></pre><div class="copy"><div aria-live="polite"></div><button title="Copy to clipboard" data-copied="Copied!" data-code="systemctl restart dovecot"><div></div></button></div></figure></div>
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<p>Dovecot’s quota limits can be configured in many ways. If you have special needs then give
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<a href="https://doc.dovecot.org/configuration_manual/quota/">their documentation</a> a look.</p> </div> <footer> <footer class="sl-flex astro-3yyafb3n"> <div class="meta sl-flex astro-3yyafb3n"> <p>Last updated: <time datetime="2023-10-04T00:00:00.000Z">Oct 4, 2023</time></p> </div> <div class="pagination-links print:hidden astro-u2l5gyhi" dir="ltr"> <a href="/ispmail-bookworm/let-postfix-send-emails-to-dovecot/" rel="prev" class="astro-u2l5gyhi"> <svg aria-hidden="true" class="astro-u2l5gyhi astro-c6vsoqas" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.5rem;"><path d="M17 11H9.41l3.3-3.29a1.004 1.004 0 1 0-1.42-1.42l-5 5a1 1 0 0 0-.21.33 1 1 0 0 0 0 .76 1 1 0 0 0 .21.33l5 5a1.002 1.002 0 0 0 1.639-.325 1 1 0 0 0-.219-1.095L9.41 13H17a1 1 0 0 0 0-2Z"/></svg> <span class="astro-u2l5gyhi"> Previous <br class="astro-u2l5gyhi"> <span class="link-title astro-u2l5gyhi">Let Postfix send emails to Dovecot</span> </span> </a> <a href="/ispmail-bookworm/testing-imap/" rel="next" class="astro-u2l5gyhi"> <svg aria-hidden="true" class="astro-u2l5gyhi astro-c6vsoqas" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.5rem;"><path d="M17.92 11.62a1.001 1.001 0 0 0-.21-.33l-5-5a1.003 1.003 0 1 0-1.42 1.42l3.3 3.29H7a1 1 0 0 0 0 2h7.59l-3.3 3.29a1.002 1.002 0 0 0 .325 1.639 1 1 0 0 0 1.095-.219l5-5a1 1 0 0 0 .21-.33 1 1 0 0 0 0-.76Z"/></svg> <span class="astro-u2l5gyhi"> Next <br class="astro-u2l5gyhi"> <span class="link-title astro-u2l5gyhi">Testing IMAP</span> </span> </a> </div> </footer> <script defer src="https://comentario.workaround.org/comentario.js"></script>
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