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Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
Roundcube - Web-based IMAP email client
sSMTP - sSMTP is a simple MTA to deliver mail from a computer to a mail server.
Mailpile - Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
OpenSMTPD - OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.