Alternatives to Lettre for all platforms with any license

  • Postfix

    Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail. It attempts to be fast, easy to administer, and secure. The software is also known by...

    Free Open Source Mac Linux

    Email Server Add a feature

    Postfix icon

  • OpenSMTPD

    OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with some additional standard extensions. It allows ordinary machines to...

    Free Open Source Linux BSD Self-Hosted

    SMTP Add a feature

    OpenSMTPD icon

  • Inbucket

    Inbucket is an email testing application; it will accept messages for any email address and make them available to view via a web interface.

    Free Open Source Mac Windows Linux

    POP3 Support SMTP Add a feature

  • Go-Guerrilla

    A lightweight SMTP server written in Go, made for receiving large volumes of mail. To be used as a package in your Go project, or as a stand-alone daemon by running the...

    Free Open Source Web

    SMTP Add a feature

    Go-Guerrilla icon

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