Postfix AlternativesMail Servers and other similar apps like Postfix

Apps similar to Postfix include Mail-in-a-box, which is free and open source. Other options are Stalwart, Mailpit, MailHog and KumoMTA. You're spoiled for choice with Mail Servers like Postfix: we list more than 25 alternatives for Linux, Mac, Windows, self-hosting and the web.

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Alternatives
Postfix alternatives page was last updated

Alternatives list

  1. Mail-in-a-box icon

    Mail-in-a-box

     23 likes

    Easy-to-deploy mail server.

    23 Mail-in-a-box alternatives

    Cost / License

    Application type

    Platforms

    • Self-Hosted
    • Roundcube
    • US flagUnited States
    Control Panel
    Good alternative?
     
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    1
  2. Stalwart icon

    Stalwart

     5 likes

    Stalwart is an open-core mail server solution with JMAP, IMAP4, POP3, and SMTP support and a wide range of modern features. It is written in Rust and designed to be secure, fast, robust and scalable.

    7 Stalwart alternatives

    Cost / License

    Application type

    Platforms

    • Self-Hosted
    • Docker
    • Linux
    • Windows
    • Mac
    • US flagUnited States
    Setup demonstration
    Good alternative?
     
  4. Mailpit icon

    Mailpit

     4 likes

    An email and SMTP testing tool with API for developers.

    37 Mailpit alternatives

    Cost / License

    • Free
    • Open Source (MIT)

    Platforms

    • Mac
    • Windows
    • Linux
    • DE flagGermany
    • European Union flagEU
    Mailpit screenshot 1
    Good alternative?
     
  5. MailHog icon

    MailHog

     8 likes

    MailHog is an email testing tool inspired by MailCatcher, but easier to install.

    35 MailHog alternatives

    Cost / License

    • Free
    • Open Source

    Alerts

    • Discontinued

    Platforms

    • Mac
    • Windows
    • Linux
    • Docker
    MailHog screenshot 1
    Good alternative?
     
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    1
  6. KumoMTA icon

    KumoMTA

     4 likes

    KumoMTA is the only true Open-Source PowerMTA alternative, capable of matching performance of several million messages per hour while providing granular traffic shaping configuration and automation across unlimited IPs.

    Cost / License

    Application type

    Platforms

    • Self-Hosted
    KumoMTA screenshot 1
    Good alternative?
     
  8. Exim icon

    Exim

     11 likes

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

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Linux
    Good alternative?
     
  9. OpenSMTPD icon

    OpenSMTPD

     6 likes

    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 exchange e-mails with other systems speaking the SMTP protocol.

    Cost / License

    • Free
    • Open Source

    Platforms

    • Linux
    • BSD
    • Self-Hosted
    Good alternative?
     
  10. Haraka icon

    Haraka

     3 likes

    Haraka is an open source SMTP server written in Node.js which provides extremely high performance coupled with a flexible plugin system allowing Javascript programmers full access to change the behaviour of the server.

    Cost / License

    • Free
    • Open Source (MIT)

    Platforms

    • Self-Hosted
    • Node.JS
    Good alternative?
     
  11. Sendmail icon

    Sendmail

     4 likes

    Sendmail is a general purpose internetwork email routing facility that supports many kinds of transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet.

    26 Sendmail alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Linux
    • US flagUnited States
    Main Page
    Good alternative?
     
  12. MailDotNull icon

    MailDotNull

     1 like

    MailDotNull is a local mail catcher for development. It emulates the HTTP send APIs of popular email providers (Resend, SendGrid, Mailjet, Mailgun, Postmark, Brevo, Amazon SES) plus plain SMTP with STARTTLS and SMTPS.

    Cost / License

    • Free
    • Open Source (MIT)

    Platforms

    • Online
    MailDotNull screenshot 1
    Good alternative?
     
  13. S

    sSMTP

     3 likes

    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. Unlike Exim4, sSMTP does not receive mail, expand aliases, or manage a queue.

    Cost / License

    Alerts

    • Discontinued

    Platforms

    • Linux
    Good alternative?
     
  14. Courier-MTA icon

    Courier-MTA

     7 likes

    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 provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Mac
    • Linux
    • BSD
    • Self-Hosted
    Good alternative?
     
12 of 27 Postfix alternatives