
KumoMTA
Postfix
PowerMTA
MailerQ
GreenArrow Engine
Sendmail
Exim
Scriptable and scalable SMTP server and email framework designed for service providers.

Managed Hosting for developers, entrepreneurs, and businesses like yours

Website, pricing, platforms and company facts side by side.
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| Website | halon.io | opalstack.com |
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When comparing Halon MTA and Opalstack, you can also consider the following products.

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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Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
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PowerMTA is an industrial-strength software for high-volume email delivery.
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MailerQ is a high performance Mail Transfer Agent (MTA) designed for delivering large volume email messages at very high speeds.
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GreenArrow Transactional Email provides a flexible and secure SMTP and API email delivery from application or website.
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Sendmail is a general purpose internetwork email routing facility that supports many kinds of...
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