Alternatives to Postfix for Linux with any license

  • 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
  • MailHog

    MailHog is an email testing tool inspired by MailCatcher, but easier to install. - Configure your application to use MailHog for SMTP delivery - View emails in the web...

    Free Open Source Mac Windows Linux

    MailHog 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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    OpenSMTPD 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
  • MailerQ

    MailerQ is a high performance Mail Transfer Agent (MTA) and a very fast SMTP server, designed to deliver large volumes of email messages at very high speeds. MailerQ is...

    Commercial Linux

    MailerQ icon
  • 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
  • PowerMTA

    Email gateway application (SMTP server) that makes it easy for senders to adopt the latest authentication specifications ( SPF and DKIM) to comply with changing ISP...

    Commercial Windows Linux Self-Hosted

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    PowerMTA icon
  • msmtp

    In the default mode, it transmits a mail to an SMTP server (for example at a free mail provider) which takes care of further delivery. To use this program with your...

    Free Open Source Linux Xfce

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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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  • esmtp

    esmtp is a user configurable relay-only Mail Transfer Agent (MTA) with a sendmail compatible syntax. It's based on libESMTP supporting the AUTH (including the...

    Free Open Source Linux BSD

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  • 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

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  • Lettre

    Lettre provides the following features: Multiple transport methods Unicode support (for email content and addresses) Secure delivery with SMTP using encryption and...

    Free Open Source Mac Windows Linux

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    Lettre icon

Platforms

Desktop

Show 6 less popular platforms