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Courier Mail Server

Integrated mail server with IMAP, POP, and webmail

Mail Servers ★ 13 stars Hard setup GPL-3.0

Courier is an integrated mail server suite that combines an MTA with IMAP, POP3, ESMTP, and webmail components. It provides a complete mail system from a single coordinated project.

Official siteSource code

Key features

  • Integrated MTA and IMAP
  • Built-in webmail
  • Maildir storage
  • LDAP authentication

Strengths

  • Released under the GPL-3.0 license
  • Written in C
  • Lightweight — runs in 512 MB RAM

Is Courier Mail Server secure?

OSV.dev lists 1 published advisory for Courier Mail Server. It doesn't publish GitHub releases we can match, so we can't say which of them apply to the current version. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

  • Most recent fixed advisory CVE-2026-67194, published 2026-07-29 (77 days ago)

Source: OSV.dev, checked 2026-10-14. How this is measured.

Courier Mail Server replaces

Self-hosted Microsoft Exchange alternatives

Health badge

Maintain Courier Mail Server? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 62 · good

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[![SelfHostIndex health score for Courier Mail Server](https://selfhostindex.com/badge/courier-mta.svg)](https://selfhostindex.com/app/courier-mta/)
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   :alt: SelfHostIndex health score for Courier Mail Server
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The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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