Alternatives to PowerMTA for all platforms with any license

Platforms

Desktop

Web / Online

Indie / Classic

  • Zentyal icon

    Zentyal

    Zentyal is an email and groupware solution, natively compatible with Outlook, for those seeking a Microsoft Exchange alternative on...

    Open Source Linux

  • Postfix icon

    Postfix

    Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail. It attempts to be fast, easy to administer, and...

    Open Source Mac Linux

  • Zimbra Collaboration Suite icon

    Zimbra Collaboration Suite

    Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web...

    Freemium Linux Web / Cloud

  • Microsoft Exchange Server icon

    Microsoft Exchange Server

    Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft...

    Commercial Windows Web / Cloud

  • Exim icon

    Exim

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

    Open Source Mac Windows Linux

  • hMail Server icon

    hMail Server

    hMailServer is a free e-mail server for Microsoft Windows. Its used by Internet service providers, companies, governments, schools and...

    Open Source Windows

  • Courier-MTA icon

    Courier-MTA

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

    Open Source Mac Linux BSD Self-Hosted

  • Sendmail icon

    Sendmail

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

    Open Source Mac Linux

  • Atmail Email Server icon

    Atmail Email Server

    Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows. ...

    Commercial Linux Web / Cloud

  • AtMail Open icon

    AtMail Open Discontinued

    AtMail is an open source webmail client written in PHP. We aim to provide a elegant Ajax webmail client for existing IMAP mailservers...

    Open Source Web / Cloud

  • Xeams icon

    Xeams

    Xeams is a secure & powerful mail server for Windows, Linux, Solaris, MacOSX and other flavors or UNIX, which supports SMTP, POP3...

    Free Mac Windows Linux BSD

  • SmarterMail Mail Server icon

    SmarterMail Mail Server

    SmarterMail delivers Exchange-level email server software features for a fraction of the cost. With lower hardware requirements...

    Freemium Windows

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  • ArgoSoft Mail Server icon

    ArgoSoft Mail Server

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

    Freemium Windows

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