Dovecot is an open-source IMAP and POP3 server for Unix-like operating systems, written primarily with security in mind.

Dovecot developers primarily aim to produce a lightweight, fast and easy-to-set-up open-source email server.

Dovecot supports a variety of authentication schemas for IMAP, POP and message submission agent (MSA) access, including CRAM-MD5 and the more secure DIGEST-MD5.

With version 2.2, some new features have been added to Dovecot, e.g. additional IMAP command extensions, dsync has been rewritten or optimized, and shared mailboxes now support per-user flags.

[7] Apple Inc. includes Dovecot for email services since Mac OS X Server 10.6 Snow Leopard.