Alternatives to Microsoft SMTP Server 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

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  • Exim

    Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

    Free Open Source Mac Windows Linux

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    Exim 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

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  • Courier-MTA

    The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier...

    Free Open Source Mac Linux BSD Self-Hosted

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    Courier-MTA icon

  • Sendmail

    Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, including the Simple Mail Transfer Protocol...

    Free Open Source Mac Linux

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    Sendmail icon

  • BulkMTA

    BulkMTA is Commercial Mail Server Similar to PowerMTA. IP Rotation, DKIM, Sender / Receiver Rate limiting

    Commercial Mac Windows Linux

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  • sSMTP

    sSMTP is a simple MTA to deliver mail from a computer to a mail server. sSMTP is simple and lightweight, there are no daemons or anything hogging up CPU; Just sSMTP....

    Free Open Source Linux

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  • Hectane

    An SMTP client that is extremely easy to configure and use, providing a simple HTTP API that is used for sending emails.

    Free Windows Linux

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    Hectane icon

  • ArgoSoft Mail Server

    Powerful and simple SMTP/POP3/Finger server, with built in Web interface for accessing mail via Web browser. Supports security features, such as SMTP authentication. Has...

    Freemium Windows

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    ArgoSoft Mail Server icon

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