This is a list of mail server software: mail transfer agents, mail delivery agents, and other computer software which provide e-mail.
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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. 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
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POP/IMAP
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JMAP
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Mail filtering
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Mail server packages
Tools
See also
- Comparison of mail servers
- Message transfer agent