added hint on chroot
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---
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title: Install software packages
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lastUpdated: 2025-08-14
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slug: ispmail-trixie/install-the-software-packages
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sidebar:
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order: 140
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---
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Let's install the necessary Debian packages. Run this command as root on your server as _root_:
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```sh
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DEBIAN_FRONTEND=noninteractive \
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apt -y install postfix-mysql dovecot-mysql \
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dovecot-imapd dovecot-lmtpd dovecot-managesieved \
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apache python3-certbot-apache libapache2-mod-php \
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php-intl php-mbstring php-xml unzip \
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roundcube-sqlite3 roundcube swaks ufw mutt \
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crowdsec crowdsec-firewall-bouncer unattended-upgrades \
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mariadb-server
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```
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While the server is downloading and installing the packages, let me give you a quick explanation of each package:
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- **postfix** / **postfix-mysql** \
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Postfix is the MTA (mail transport agent) that speaks SMTP to send and receive emails. This package installs Postfix
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with support for MariaDB databases.
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- **dovecot** \
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Dovecot manages the emsrc/content/docs/ispmail-trixie/140-install-packages.mdx emails using IMAP.
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- **-lmtpd** \
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LMTP (Local Mail Transfer Protocol) provides the glue between Postfix and Dovecot.
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- **-managesieved** \
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Lets you configure automatic processing rules on the server. Like out-of-office emails or filtering incoming emails
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to folders.
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- **-mysql** \
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Makes Dovecot able to query MariaDB databases.
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- **apache** \
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Web server. Needed for webmail.
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- **php-\*** \
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PHP is the programming language that Roundcube (the webmail software) is written in.
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- **mariadb-server** \
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Database server that helps us store control data in a MariaDB database on the mail server.
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- **roundcube** / **roundcube-mysql** \
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Webmail software that lets you access your emails in any web browser. Roundcube speaks to Dovecot to fetch emails. And
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to Postfix to send emails.
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- **swaks** \
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The SWiss Army Knife of Smtp. Helpful command-line tool to send test emails to a mail server.
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- **ufw** \
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Universal FireWall. A simple tool to manage firewall rules to limit access to your server.
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- **rspamd** \
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It reliably detects spam. Also handles adding DKIM signature to outgoing email to prevent spoofing your domains.
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- **mutt** \
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A console-based program that can speak IMAP and also read Maildirs directly. Very helpful for testing the
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functionality of your mail server. Think of it as a text-based Thunderbird.
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- **crowdsec** \
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Detects attacks to your mail server and blocks the IP address of the attacker. This is a more sophisticated version of
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fail2ban.
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- **unattended-upgrades** \
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Installs security updates automatically.
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TODO: move crowdsec into optional chapter
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TODO: postfix in no-chroot mode
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