iRedMail is a full-featured mail server solution that supports email services like SMTP, IMAP, POP3, and webmail.
Free and Paid versions available
Best Stalwart Alternatives ranked by AI · updated Aug 2026
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Stalwart is an open-source, all-in-one mail server supporting JMAP, IMAP, SMTP, and modern email security standards. It targets self-hosters, organizations, and service providers that want a high-performance server with fewer external dependencies.
Top 6 Stalwart alternatives
Mail-in-a-Box provides a full stack mail server solution with webmail and contacts. It enables easy mail hosting and management.
mailcow is a modern mail server suite based on Dovecot, Postfix, SOGo, and other open-source software. It provides a complete email solution...
Modoboa is a mail hosting and management platform including a modern and simplified web interface for user and domain administration.
Free and open-source
Poste.io is a complete mail server solution with a modern web interface, spam filter, calendar, and contacts.
Starting at $19/month
WildDuck is an open-source, horizontally scalable IMAP and POP3 mail server built with Node.js and MongoDB. It is intended for developers and...
Pros
- Scales horizontally more naturally than traditional single-node mail stacks
- Modern Node.js and MongoDB architecture suits custom platform development
- Supports multi-domain hosting and large mailbox deployments
Cons
- Requires separate components for SMTP delivery, filtering, DNS, and administration
- Smaller community and ecosystem than Dovecot-based platforms
- More operational work than turnkey suites such as Mailcow
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