Halon MTA Alternatives

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

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

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.

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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

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

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

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

Open Source

You can use SendGrid via SMTP or our simple to use Web API. Understand how best to utilize SendGrid.

Scale your business email & marketing messages with Amazon Simple Email Service (SES), a cost-effective and reliable cloud email service. Sign up today.

Open Source

NikaMail is a portable, extendable, zero-config email server.

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

An open source mailserver suite.

Open Source

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

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

free