MailerQ Alternatives

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

PowerMTA is an industrial-strength software for high-volume email delivery.

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)

EmailSuccess is an advanced MTA built to handle the most critical reliability, performance, security, and deliverability requirements.

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

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

Open Source

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

Sendmail is a general purpose internetwork email routing facility that supports many kinds of...

CMail is a free Windows command line mailer with advanced message formatting options.

free

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

GreenArrow Transactional Email provides a flexible and secure SMTP and API email delivery from application or website.

sSMTP is a simple MTA to deliver mail from a computer to a mail server.

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.

An open source mailserver suite.

Open Source