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Exim

Flexible and widely deployed mail transfer agent

Mail Servers Archived ★ 785 stars Hard setup GPL-2.0

This project is archived. Upstream development has stopped, so expect no new features or security fixes. Consider an actively maintained mail servers alternative.

Exim is a highly configurable mail transfer agent used to route and deliver email on Unix systems. It powers a large share of the internet's mail servers and supports extensive policy and ACL controls.

Official siteSource code

Key features

  • Powerful routing rules
  • ACL-based policy
  • Wide platform support
  • Mature codebase

Pros & cons

Strengths

  • Extremely flexible
  • Proven at scale

Trade-offs

  • Complex configuration
  • Easy to misconfigure

Is Exim secure?

OSV.dev lists 47 published advisories for Exim. 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-2025-67896, published 2025-12-14 (304 days ago), fixed in 4.99.1

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

Exim replaces

Self-hosted Microsoft Exchange alternatives

Health badge

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SelfHostIndex: 15 · archived

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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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