Skip to content
whatismyalternative

OpenSMTPD

A free implementation of the server-side SMTP protocol as defined by RFC 5321, with some 2

Visit OpenSMTPD

OpenSMTPD is a free implementation of the server-side SMTP protocol as defined in RFC 5321, along with additional standard extensions. It enables ordinary machines to exchange email with other systems that speak SMTP, and is described as a fairly complete SMTP implementation. The project is part of the OpenBSD Project and is released under the ISC license.

The software is primarily developed by Gilles Chehade and Eric Faurot, with contributions from OpenBSD hackers and members of other communities. It is developed using the same security process used by the OpenBSD group, and security issues can be reported to a private developers mailing list. The project publishes security advisories covering past releases, with fixes addressed in newer snapshots and releases.

7 alternatives to OpenSMTPD

Ranked by how well each tool replaces OpenSMTPD: shared features, audience, price and popularity.

  1. iRedMail

    Free, Open Source Mail Server Solution

    Has a free plan.

    Free planOpen source
    56 out of 100 matchFree

  2. Postfix

    A mail server intended as an alternative to Sendmail

    Open source
    54 out of 100 match—

  3. Postal

    An open source mail delivery platform

    Open source
    49 out of 100 match—

  4. OpenBSD

    Only two remote holes in the default install, in a heck of a long time

    Has a free plan.

    Free planOpen source
    43 out of 100 matchFree

  5. OpenSSH

    Premier connectivity tool for remote login with the SSH protocol

    Open source
    39 out of 100 match—

  6. Modoboa

    Open source email server with a web administration interface

    Has a free plan.

    Free planOpen source
    36 out of 100 matchContact sales

  7. Courier Mail Server

    Fast, scalable enterprise mail and groupware server with ESMTP, IMAP, POP3, and webmail.

    Open source
    36 out of 100 matchFree