Here’s our verdict on free and open source email servers. We recommend Exim, OpenSMTPD, mox, DBMail, WildDuck, and Stalwart.
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Tag: email server
Haraka – extensible SMTP server
Haraka is an extensible SMTP server with a plugin framework, mail filtering, authentication, outbound queueing, and custom delivery routes.
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maddy – composable all-in-one mail server
maddy combines SMTP delivery, IMAP mail storage, authentication, flexible routing, TLS management, and email security in one server.
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Mail-in-a-Box – self-hosted email server solution
Mail-in-a-Box automates self-hosted email with webmail, SMTP, IMAP, calendar and contact syncing, DNS management, and backups.
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Mailu – self-hosted mail server stack
Mailu is a self-hosted mail server stack offering SMTP, IMAP, webmail, account administration, spam filtering, and email security tools.
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Modoboa – mail hosting and management platform
Modoboa provides web-based email hosting administration, webmail, domain management, Sieve filters, traffic reports, and integration tools.
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Stalwart – all-in-one mail and collaboration server
Stalwart is an all-in-one mail and collaboration server with SMTP, IMAP, JMAP, CalDAV, CardDAV, WebDAV, filtering and web administration.
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dma – compact mail transfer agent
dma is a compact mail transfer agent for local submission and outbound delivery, with SMTP authentication, TLS and simple configuration.
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WildDuck – scalable IMAP and POP3 email server
WildDuck is a scalable IMAP and POP3 server with MongoDB storage, REST API management, strong authentication and Unicode email support.
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mox – modern, secure, all-in-one email server
mox is a self-hosted email server combining SMTP, IMAP, webmail, spam filtering, TLS automation, and modern mail security standards.
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Sendmail – configurable mail transfer agent
Sendmail is a configurable mail transfer agent with flexible routing, SMTP authentication, TLS, policy controls and mail filtering.
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qmail – modern SMTP server
qmail is an Internet Mail Transfer Agent (MTA). It was written as a more secure replacement for the popular Sendmail program.
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chasquid – SMTP server focused on simplicity and security
chasquid is an SMTP mail server for smaller installations, with virtual domains, secure transport, address aliases, monitoring, and filters.
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Citadel – email and groupware server
Citadel is an email and groupware server with SMTP, IMAP, POP3, calendars, contacts, web access, mailing lists and collaboration tools.
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Dovecot – secure IMAP and POP3 server
Dovecot is a secure, high-performance IMAP and POP3 server with authentication, mailbox indexing, Sieve filtering and flexible storage.
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Cyrus IMAP – email, contacts and calendar server
Cyrus IMAP is a scalable email, contacts and calendar server with IMAP, JMAP, CalDAV, CardDAV, replication, quotas and access controls.
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Courier – integrated mail and groupware server
Courier is an integrated mail server providing ESMTP, IMAP, POP3, webmail, mailing lists, authentication and Maildir-based message storage.
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Postfix – secure and widely deployed mail transfer agent
Postfix is a secure and widely deployed mail transfer agent with flexible routing, TLS, SMTP authentication, filtering and policy controls.
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Zimbra – email and collaboration server
Zimbra is a collaboration server combining email, calendars, contacts, webmail and administration with open source components.
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DBMail – scalable database-backed email server
DBMail stores email and account data in SQL databases, providing scalable IMAP, POP3 and LMTP services without filesystem mailboxes.
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