PowerMTA Alternatives

Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

An open source mailserver suite.

Open Source

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

Visit website paid $19.5 / Monthly (Pro)

Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.

Open Source

MailerQ is a high performance Mail Transfer Agent (MTA) designed for delivering large volume email messages at very high speeds.

Open-Xchange Server 6 is the most advanced Linux based Groupware solution f.

Simple, easy and secure mail server with a convenient and simple interface.

Mailu is a simple yet full-featured mail server as a set of Docker images.

A fully fledged, free email server solution, an open source project (GPL v2).

Open Source

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

Open Source

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

KumoMTA is the world's first Open-Source MTA designed from the ground-up for large-volume senders. Get a fast, flexible, supported solution.

Open Source free

Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.

Scriptable and scalable SMTP server and email framework designed for service providers.