A small and easy to configure SMTP and POP3 server for Windows and Linux. (Source Code) GPL-3.0 C++
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Open Source standalone trashmail solution that ships its own mail server
Message transfer agent (MTA). Sendmail 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