The best open source alternative to Mail.be is Mailpile. If that doesn't suit you, our users have ranked more than 25 alternatives to Mail.be and three of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Mail.be are Zero Email and Inboxer.
Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features. The development of Mailpile is funded by a large community of backers and all code related to the project is and will be released under an OSI approved Free Software license.
Zero is an open-source AI email solution that gives users the power to self-host their own email app while also integrating external services like Gmail and other email providers. Our goal is to modernize and improve emails through AI agents to truly modernize emails.
Unofficial, free and open-source Google Inbox Desktop App. Built using electron, Inboxer includes a menu bar which is globalmenu compatible and works, and keyboard shortcuts.
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