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.
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Open-Source Alternatives.
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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
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A fully fledged, free email server solution, an open source project (GPL v2).
Key iRedMail features:
Open Source Comprehensive Features Easy Installation Excellent Documentation
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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
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An open source mailserver suite.
Key mailcow features:
Comprehensive Feature Set Open Source Docker-based Deployment Active Community and Support
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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
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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
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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
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Web-based IMAP email client.
Key Roundcube features:
Open Source User-Friendly Interface Extensibility Security
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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
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PowerMTA is an industrial-strength software for high-volume email delivery.
Key PowerMTA features:
High Deliverability Scalability Advanced Analytics Customization
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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
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Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.
Key Microsoft Exchange Server features:
Integration Security Scalability Mobility
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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
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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