Zimbra is an enterprise-class email, calendar, and collaboration solution built for the cloud, both public and private.
Starting at $6 per mailbox per year
Best Maddy Alternatives ranked by AI · updated Aug 2026
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Maddy is an open-source all-in-one mail server written in Go for self-hosters and small organizations. It combines SMTP submission and delivery with IMAP, authentication, DKIM, and related mail-server components.
Top 6 Maddy alternatives
iRedMail is a full-featured mail server solution that supports email services like SMTP, IMAP, POP3, and webmail.
Free and Paid versions available
Mail-in-a-Box provides a full stack mail server solution with webmail and contacts. It enables easy mail hosting and management.
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
Postfix is an open-source mail-transfer agent used to send, receive, and relay email on Unix-like systems. It is designed for secure, reliable...
Pros
- More widely deployed and documented than Haraka
- Strong security defaults and operational stability
- Broad integration with Linux mail-hosting tools
Cons
- Less flexible for JavaScript-based custom workflows than Haraka
- Configuration syntax can be complex for advanced setups
- Not a complete mailbox or webmail platform by itself
Free, open source
Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and delivery methods.
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