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10 Superb Mail Servers for Linux Users

Electronic mail remains the most preferred method of digital communication among users. Hence, it comes as no surprise that even in 2021, MTA-server usage exhibits the following statistics:

  • Desktop: 19.4%

  • Webmail: 36.1%

  • Mobile: 43.0%

  • Other: 1.5%

Mail servers help you localize your electronic mail and its contents. These servers, also referred to as Mail Transfer Agents (MTA), consolidate your SMPT, IMAP, XMPP, and POP3 configurations with robust security and customizability.

There is a huge demand for a quality mail server for Linux users, given that Linux is one of the most popular open-source platforms for Web service deployment and other business, research, and academic computation.

We are already familiar with premium-grade email services such as Gmail, Yahoo Mail, Outlook, etc. However, there is a breed of mail servers for Linux users that are offering competitive advantages.

The following 10 mail servers are helping Linux users with different use cases streamline communications along with added benefits.


The C language-coded Exim server offers stable execution even across legacy systems. Exim is specifically trusted for its resilient anti-spamming features that permit three different log mechanisms- main, panic, and rejected log.

The server software uses a Sendmail-like design model, with a single binary in charge of the MTA. Exim’s performance shines through its cross-platform support. Exim is compatible with DBMS systems such as Postgre, MySQL, Oracle DB, Redis, SQLite, etc.

At a point in 2021, it was estimated that 60% of the publicly reachable mail servers were using Exim.


Postfix is another highly secure mail serving agent for Linux and Unix-like OS platforms, similar to Exim in core concept. The open-source mail server is also available in a ready-to-run code format, so hardware and software vendors can slipstream it in their service bundles.

Postfix has excellent support for operating Linux containers with daemon and non-daemon workflow advantages. Users may also expect flexible junk mail control, and extensive protocol supports for security, plugin, and proxy server configuration support.


SquirrelMail describes itself as a standards-based WebMail package that was written originally in PHP. It is available both as a Web-based mail client and also as an IMAP proxy server. It dispenses a highly functional mail server agent with configurable IMAP/SMTP protocols.

The software recently received a post-version release update that boosts its security further. It allows you to easily view and manage dynamic HTML/PHP content and offers MIME support advantages and other advantageous management features.


Axigen promises Linux users a highly performant mail server experience with advantages such as an easily configurable setup, integrated mailing lists, Fully Automated Migration Tools (FAMT), and imports from Yahoo, Gmail, etc. clients.

Axigen comes in a premium as well as a free version. Even the free version boasts of MTA support for up to five domains, users, and groups. Axigen’s UI/UX helps them get around the security, encryption, custom sender/recipient (by group), and spam management features.


The Citadel impressed users on Linux and BSD systems long before most of the services on this list were even launched or had attained prominence. Citadel is a battle-tested mail server with reliable security and encryption features that are easily managed and controlled.

Citadel renders SMTP, IMAP, Sieve, POP3, GroupDAV, and XMPP support for one-to-one, one-to-many, and batch mailing requirements. It has an easily-maneuvered address book, a file storage system with SSL/TLS encryption, OpenLDAP, and Microsoft Active Directory support for server-to-server mailing operations.

Citadel runs on a Berkley DB backend. Its nifty instant messaging features, scheduler, and Web-based and Ajax-style UI/UX make it the ideal mail server utility.

Zimbra Email Server

Zimbra was born out of the need to enforce stronger email communication security. Zimbra offers us a highly responsive, React-based email server. Through its seamless Zimlet framework, Zimbra readily integrates with productivity tools like Slack, Zoom, and Dropbox.

Zimbra further pushes productivity with efficient calendar synchronization, spam management, priority mail backups, and documentation storage. A credible backup system ensures your Web-based operations are never lost even in the worst instances of service disruption. Zimbra also permits you to synchronize your data between your devices.

Zimbra already supports TLS/SSL certificates and LDAP integration. If you want to further secure your server, you can easily conduct network perimeter surveillance on the whole system in real-time.


Horde is the ultimate groupware Webmail solution for Linux distros. Horde packs some enticing IMAP/POP3 client configuration systems, an intelligent UI, S/MIME, and PGP support.

Built from standard-compliant components, Horde finds use for its search, filtering, and admin functions. It boasts of a highly formattable, HTML-based WYSIWYG editor as well as premium note-taking, listing, scheduling, and calendar arrangement features.

Maintenance from the developers and contribution from a proactive community has made Horde into a highly productive and stable mail server for Linux users.


SendMail offers a flawless SMTP mail server set-up that ensures every business communication reaches your inbox hassle-free. SendMail offers unparalleled SSL security certification so you can receive emails with dynamic content, without any fear of attracting malware.

SendMail’s queuing feature for connection challenges is also quite performant. With Cloud integration, businesses can streamline their business comms with their data tools and Cloud app ecosystem.


Modoboa is here to simplify email server setup, usage, and administration for the less technically-nuanced Linux users who want a self-hosted email service. It gives us a neat and legible UI that’s easy to get around. Modoboa relies on SQL-based backends for communication between components.

The lightweight but efficient email client is written with Python and governed by an ISC license. Modoboa also easily integrates with other Linux servers such as Dovecot and Postfix, enabling seamless email comms, migrations, and synchronizations.


Dovecot is rated as an open-source IMAP mail server popularized across the globe for its service and features. It is available both as a free MTA but can be scaled to a commercial solution for enterprise use. It boasts of self-optimizing, self-healing indexes with excellent admin features.

Dovecot’s flexible authentication system, and file system management. Its integration with Postfix and Exim, and migrational capabilities from other IMAP and POP3 server systems make it a versatile Linux MTA solution.

Thus, these dedicated mail servers are some of the most advanced and competitively multifaceted. They can improve, simplify, automate, and secure your digital communications with client systems, be it for personal or business use.

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