Article · Wikipedia archive · Last revised Jun 3, 2026

List of mail server software

This is a list of mail server software: mail transfer agents, mail delivery agents, and other computer software which provide e-mail.

Last revised
Jun 3, 2026
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≈ 2 min
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Wikipedia ↗

This is a list of mail server software: mail transfer agents, mail delivery agents, and other computer software which provide e-mail.

Product statistics

All such figures are necessarily estimates because data about mail server share is difficult to obtain; there are few reliable primary sources—and no agreed methodologies for its collection.

Surveys probing Internet-exposed systems typically attempt to identify systems via their banner, or other identifying features.1 As of December 2023, Postfix and exim appeared to be the overwhelming leaders in mail server types, with greater than 92% share between them, having come to prominence before 2010 in each case.1a While such methods are effective at identifying mail server share for receiving systems, most large-scale sending environments are not listening for traffic on the public internet and will not be counted using such methodologies.

SMTP

POP/IMAP

JMAP

Mail filtering

Mail server packages

Tools

  • Swaks (Swiss Army Knife for SMTP)
See also

See also

References

References

  1. "Mail (MX) Server Survey". Security Space. Ontario, Canada: E-Soft Inc. 1 December 2023. Retrieved 19 December 2023.
  2. "SMTP server (MTA) written in Go".
  3. "Libraesva Email Security Gateway (ESG)". Libraesva. Retrieved 2024-06-15.
  4. "Proxmox Mail Gateway". Proxmox. Retrieved 2021-07-04.
  5. "Information Protection". Proofpoint. Retrieved 2017-08-30.
  6. "docker-mailserver github". GitHub.
  7. "iRedMail - Free, Open Source Mail Server Solution". iredmail.org.
  8. "Composable all-in-one mail server written in Go".
  9. "mailcow: dockerized - Blog". mailcow: dockerized - Blog.
  10. "Mailu - Insular email distribution as container images".
  11. Nguyen, Antoine. "Modoboa". Modoboa.
  12. "Mox: modern, secure, all-in-one mail server".
  13. "A fully featured open source mail delivery platform for incoming & outgoing e-mail written in Ruby". GitHub.
  14. "Poste.io".
  15. "Stalwart - All-in-one JMAP, IMAP, SMTP mail server".

Notes

  1. The following server types are mentioned in the Mail (MX) Server Survey but are not represented here - ArGoSoft, GroupWise, InterScan VirusWall, MagicMail, MessageWall, ModusMail, Neon Mail Server, OpenVMS, Post.Office, Trend Micro, VisNetic.
  2. mentioned in Mail (MX) Server Survey 2023
  3. uses ESMTP protocol