From Halon, SMTP software for hosting providers
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At its core, Halon is a scriptable SMTP server

The Halon platform is the most flexible, scalable and full-featured email processing and security platform.

Being a highly scriptable SMTP server (MTA, email gateway), it's typically used by service providers as the platform upon which their email services are built.

This article contains a list of features, but is in no way comprehensive. Please see the release notes to find out when a specific feature was introduced.