List of mail server software

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

Product statistics[edit]

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.[1][a] 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.



Mail filtering[edit]

Mail server packages[edit]

See also[edit]


  1. ^ a b "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. ^ "Proxmox Mail Gateway". Proxmox. Retrieved 2021-07-04.
  4. ^ "Information Protection". Proofpoint. Retrieved 2017-08-30.
  5. ^ "docker-mailserver github". GitHub.
  6. ^ "iRedMail - Free, Open Source Mail Server Solution".
  7. ^ "Composable all-in-one mail server written in Go".
  8. ^ "mailcow: dockerized - Blog". mailcow: dockerized - Blog.
  9. ^ "Mailu - Insular email distribution as container images".
  10. ^ Nguyen, Antoine. "Modoboa". Modoboa.
  11. ^ "A fully featured open source mail delivery platform for incoming & outgoing e-mail written in Ruby".
  12. ^ "".


  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. ^ a b c d e f g h i j k l m n o p q r s t u v w x mentioned in Mail (MX) Server Survey 2023
  3. ^ uses ESMTP protocol