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CMail - CMail is a free Windows command line mailer with advanced message formatting options.
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
mailsend-go - mailsend-go is a command line tool to send mail via SMTP protocol, written with golang.
Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
sendEmail - sendEmail is a lightweight, command line SMTP email client.
mailcow - An open source mailserver suite.