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OpenSMTPD
Secure SMTP server implementation from the OpenBSD project.
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Open source
Self-hostable
ISC
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Asterisk
Easy to use but advanced IP PBX system, VoIP gateway and conference server.
GPL-2.0
C
+1Courier MTA
Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services.
GPL-3.0
C
+1
Dovecot
IMAP and POP3 server written primarily with security in mind.
MIT
LGPL-2.1
+2Exim
Message transfer agent (MTA) developed at the University of Cambridge.
GPL-3.0
C
+1
Kamailio
Modular SIP server (registrar/proxy/router/etc).
GPL-2.0
C
+1Postfix
Fast, easy to administer, and secure Sendmail replacement.
IPL-1.0
C
+1