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msmtp

Lightweight SMTP client for sending mail

Mail Servers ★ 294 stars Easy setup GPL-3.0

msmtp is a small SMTP client that acts as an SMTP relay for command-line tools and mail user agents, forwarding messages to a real mail server. It supports TLS, authentication, and multiple account profiles.

Official siteSource code

Key features

  • SMTP relay client
  • TLS and authentication
  • Multiple account profiles
  • Sendmail-compatible mode

Strengths

  • Released under the GPL-3.0 license
  • Easy to set up — beginner-friendly
  • Written in C
  • Tiny footprint — runs in 32 MB RAM

Is msmtp secure?

OSV.dev has no published security advisories for msmtp's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

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

msmtp replaces

Self-hosted Sendmail alternatives

Health badge

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SelfHostIndex: 71 · good

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