Software Alternatives, Accelerators & Startups

Postfix

Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

Some of the top features or benefits of Postfix are: Security, Performance, Compatibility, Reliability, Configuration, Community Support, and Lightweight. You can visit the info page to learn more.

Best Postfix Alternatives & Competitors in 2025

The best Postfix alternatives based on verified products, community votes, reviews and other factors.
Filter: 12 Open-Source Alternatives. Latest update:

  1. 35

    Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

    Key Zimbra features:

    Open Source Cost-Effective Scalability Feature-Rich

    /zimbra-alternatives
  2. 31

    A fully fledged, free email server solution, an open source project (GPL v2).

    Key iRedMail features:

    Open Source Comprehensive Features Easy Installation Excellent Documentation

    Open Source

    /iredmail-alternatives
  3. The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder. .

    Key MailReach.co features:

    Deliverability Improving Email Warming Meaningful Warming Content Smart Warming Algorithm

    Visit website paid $19.5 / Monthly (Pro)

    Visit website
  4. 24

    An open source mailserver suite.

    Key mailcow features:

    Comprehensive Feature Set Open Source Docker-based Deployment Active Community and Support

    Open Source

    /mailcow-alternatives
  5. 38

    Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

    Key Exim features:

    Highly Configurable Flexible Routing Active Community Support Efficient Transport Mechanism

    Open Source

    /exim-alternatives
  6. 32

    Sendmail is a general purpose internetwork email routing facility that supports many kinds of...

    Key Sendmail features:

    Established Reputation Highly Configurable Open Source Wide Compatibility

    /sendmail-alternatives
  7. 25

    sSMTP is a simple MTA to deliver mail from a computer to a mail server.

    Key sSMTP features:

    Lightweight Easy Configuration Secure Email Sending Simplified Use Case

    /ssmtp-alternatives
  8. 18

    Web-based IMAP email client.

    Key Roundcube features:

    Open Source User-Friendly Interface Extensibility Security

    Open Source

    /roundcube-alternatives
  9. 19

    Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.

    Key Mail-in-a-box features:

    Ease of Setup Full Control Cost-effective Open Source

    Open Source

    /mail-in-a-box-alternatives
  10. 17

    PowerMTA is an industrial-strength software for high-volume email delivery.

    Key PowerMTA features:

    High Deliverability Scalability Advanced Analytics Customization

    /powermta-alternatives
  11. 14

    MailerQ is a high performance Mail Transfer Agent (MTA) designed for delivering large volume email messages at very high speeds.

    Key MailerQ features:

    High Performance Flexible Configuration Scalability Real-time Monitoring

    /mailerq-alternatives
  12. 16

    Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.

    Key Microsoft Exchange Server features:

    Integration Security Scalability Mobility

    /microsoft-exchange-server-alternatives
  13. 22

    OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...

    Key OpenSMTPD features:

    Simplicity Security-focused Lightweight Integration with OpenBSD

    Open Source

    /opensmtpd-alternatives
  14. 11

    Dovecot is an open source IMAP and POP3 email server for Linux/UNIX-like systems, written with...

    Key Dovecot features:

    High Performance Robust Security Features Easy Configuration Extensive Protocol Support

    Open Source

    /dovecot-alternatives
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