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OpenSMTPD Alternatives

OpenSMTPD is described as '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' and is an app in the office & productivity category. There are more than 10 alternatives to OpenSMTPD for a variety of platforms, including Linux, Mac, Windows, BSD and Self-Hosted solutions. The best alternative is Postfix, which is both free and Open Source. Other great apps like OpenSMTPD are sSMTP, Sendmail, Exim and Inbucket.

This page was last updated Jun 14, 2018
  • FreeOpen Source
  • Linux
  • BSD
  • Self-Hosted

OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with some additional standard...

Learn more about OpenSMTPD

  1. Postfix

    • FreeOpen Source
    • Mac
    • Linux

    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 its former names VMailer and IBM Secure Mailer.

  2. sSMTP

    • FreeOpen Source
    • Linux

    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.

    Discontinued

    The last update was in 2013.

    No screenshots yet


  3. Sendmail

    • FreeOpen Source
    • Mac
    • Linux

    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.

  4. Exim

    • FreeOpen Source
    • Mac
    • Linux

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

    No screenshots yet
  5. Inbucket

    • FreeOpen Source
    • Mac
    • Windows
    • Linux

    Need to test your webapps outbound emails with Mailinator but stuck behind a firewall? Want to keep the new application you are developing secret until it’s time to release it? Need to validate that emails go out as part of your integration test suite?



  6. Courier-MTA

    • FreeOpen Source
    • Mac
    • Linux
    • BSD
    • Self-Hosted

    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.

    No screenshots yet
  7. Dragonfly Mail Agent

    • FreeOpen Source
    • Linux
    • BSD

    A small Mail Transport Agent (MTA), designed for home and office use. Part of DragonFly BSD , it accepts mails from locally installed Mail User Agents (MUA) and delivers the mails either locally or to a remote destination.

    No screenshots yet
  8. Microsoft SMTP Server

    • Windows

    Configure SMTP e-mail in IIS when you want to deliver e-mail messages from your site. Mail can be delivered immediately or it can be delivered to a file location on disk where it can be retrieved for delivery later.

  9. Haraka

    • FreeOpen Source
    • Self-Hosted
    • Node.JS

    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.

    No screenshots yet
  10. NikaMail

    • FreeOpen Source
    • Mac
    • Linux

    NikaMail is a portable, extendable, zero-config email server. It is designed to perform automation tasks, provide access to mailboxes (port 110), serve as a mail transfer agent (port 587) and mail exchange service (port 25). NikaMail supports TLS.

Showing 10 of 12 alternatives