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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.

SMTP[edit]

POP/IMAP[edit]

JMAP[edit]

Mail filtering[edit]

Mail server packages[edit]

See also[edit]

References[edit]

Notes[edit]

  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

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