Alternatives to Sendmail for all platforms with any license

Platforms

Desktop

Web / Online

Development

Indie / Classic

  • Zentyal icon

    Zentyal

    Zentyal is a native Microsoft Active Directory® implementation on Linux incorporating all the network services required in a small and medium business environment: Directory & Domain Server, Mail Server, Gateway and...

    Open Source Linux

  • Postfix icon

    Postfix

    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.

    Open Source Mac Linux

  • Zimbra Collaboration Suite icon

    Zimbra Collaboration Suite

    Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically...

    Freemium Linux Web / Cloud

  • Exim icon

    Exim

    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

    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 provides ESMTP, IMAP, POP3, webmail, and mailing list services...

    Open Source Mac Linux BSD Self-Hosted

  • Microsoft Exchange Server icon

    Microsoft Exchange Server

    Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the Microsoft Servers line of server products and is widely used by enterprises using Microsoft infrastructure...

    Commercial Windows Web / Cloud

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

    Open Source Linux

  • Dragonfly Mail Agent

    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. Remote...

    Open Source Linux BSD

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

    Open Source Linux BSD Self-Hosted

  • Atmail Email Server icon

    Atmail Email Server

    Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows. Features: Webmail Calendar Addressbook IMAP, POP or Exchange WebSync SMTP/POP3/IMAP server Explore the...

    Commercial Linux Web / Cloud

  • BulkMTA

    BulkMTA is Commercial Mail Server Similar to PowerMTA. IP Rotation, DKIM, Sender / Receiver Rate limiting

    Commercial Mac Windows 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 delivered to a file location on disk where it can be retrieved for delivery later.

    Commercial Windows

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  • PowerMTA 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 policies for accountable outbound email delivery. No over hype. It...

    Commercial Windows Linux Self-Hosted

  • AtMail Open icon

    AtMail Open

    AtMail is an open source webmail client written in PHP. We aim to provide a elegant Ajax webmail client for existing IMAP mailservers, with less bloat and a focus on an intuitive, simple user interface. The open source version of...

    Open Source Web / Cloud

    • Discontinued No longer supported.
  • Hectane icon

    Hectane

    An SMTP client that is extremely easy to configure and use, providing a simple HTTP API that is used for sending emails.

    Free Windows Linux

  • ArgoSoft Mail Server icon

    ArgoSoft Mail Server

    Powerful and simple SMTP/POP3/Finger server, with built in Web interface for accessing mail via Web browser. Supports security features, such as SMTP authentication. Has built-in TZO client for users without static IP address. Version...

    Freemium Windows

  • Haraka

    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. It is used...

    Open Source Self-Hosted Node.JS

  • iMail icon

    iMail

    Fast, safe, heavy mail solution. Web-client access, LAN or WAN self-hosted server, maintenance-free design. No Windows server and database server required, unlimited mail accounts, storage, attachment size, custom logo. Free for...

    Free Windows Self-Hosted

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