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

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, with greater than 80% share between them.[2][1]

SMTP

POP/IMAP

Mail filtering

References

"Mail (MX) Server Survey". Retrieved 17 December 2018.
Security Space Mail (MX) Server Survey, April 1, 2014.
"Information Protection". Proofpoint. Retrieved 2017-08-30.

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[mx-1] "Mail (MX) Server Survey". Retrieved 17 December 2018.

[2] Security Space Mail (MX) Server Survey, April 1, 2014.

[3] "Information Protection". Proofpoint. Retrieved 2017-08-30.