The Cyrus IMAP server differs from other IMAP server implementations in that it is generally intended to be run on sealed servers, where normal users cannot log in. Users can access mail through the IMAP/IMAP-S, POP3/POP3-S or KPOP protocols. The private mailbox database design gives the server considerable advantages in efficiency, scalability, and administratability.
The Courier IMAP server is a fast, scalable, enterprise IMAP server that uses Maildirs. Many E-mail service providers use the ...
DBMail is a fast, scalable IMAP4 and POP3 server that stores all email and users in a Postgresql, MySQL or SQLite database.
Dovecot is an open source IMAP and POP3 email server for Linux/UNIX-like systems, written with security primarily in mind. Dov ...
Archiveopteryx is an Internet mail server, optimised to support long-term archival storage. It seeks to make it practical not ...