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Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
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Dovecot is an open source IMAP and POP3 email server for Linux/UNIX-like systems, written with...
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The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open...
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Open source SMTP server written in Node.js.
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DBMail is a fast, scalable IMAP4 and POP3 server that stores all email and users in a Postgresql...
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KumoMTA is the world's first Open-Source MTA designed from the ground-up for large-volume senders. Get a fast, flexible, supported solution.
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The Cyrus IMAP server differs from other IMAP server implementations in that it is generally...