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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.

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] and report Postfix and exim as overwhelming leaders in March 2021, with greater than 92% share between them.[1]

SMTP[edit]

POP/IMAP[edit]

Mail filtering[edit]

Mail server packages[edit]

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