Message transfer agent (MTA). Sendmail C/deb
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Open Source standalone trashmail solution that ships its own mail server
Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services. (Source Code) GPL-3.0 C/deb
Fast, highly extensible, and event driven SMTP server. (Source Code) MIT Nodejs
Fast, easy to administer, and secure Sendmail replacement. IPL-1.0 C/deb