
EmailSuccess
Postfix
Sendmail
PowerMTA
KumoMTA
Exim
Halon MTA
MailerQ is a high performance Mail Transfer Agent (MTA) designed for delivering large volume email messages at very high speeds.

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When comparing MailerQ and Opalstack, you can also consider the following products.

EmailSuccess is an advanced MTA built to handle the most critical reliability, performance, security, and deliverability requirements.
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Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
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Sendmail is a general purpose internetwork email routing facility that supports many kinds of...
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PowerMTA is an industrial-strength software for high-volume email delivery.
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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.
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Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
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