Alternatives to OpenSMTPD for all platforms with any license



Web / Online


Indie / Classic

  • Postfix icon


    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

  • Exim icon


    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

  • Courier-MTA icon


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

    Open Source Mac Linux

  • Microsoft SMTP Server icon

    Microsoft SMTP Server

    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...

    Commercial Windows

  • 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...

    Open Source Linux

  • Haraka

    Haraka is an open source SMTP server written in Node.js which provides extremely high performance coupled with a flexible plugin...

    Open Source Self-Hosted Node.JS

OpenSMTPD Comments

Echo echo ... Feels empty in here

Maybe you want to be the first to submit a comment about OpenSMTPD ? Just click the button up to your right!