chasquid
0
SMTP (email) server with a focus on simplicity, security, and ease of operation.
Go
Courier MTA
0
Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic…
C
EmailRelay
0
A small and easy to configure SMTP and POP3 server for Windows and Linux.
C++
Exim
0
Message transfer agent (MTA) developed at the University of Cambridge.
C
Postfix
0
Fast, easy to administer, and secure Sendmail replacement.
C
Sendmail
0
Message transfer agent (MTA).
C