Halon modules and plugins
Halon is a fast, flexible and powerful email infrastructure software (MTA);
designed for demanding uses such as large-scale email services.
It is configured and extended using Halon script (HSL) modules
and C-compatible plugins written in languages such as Go.
halon-extras you will find lots of ready-made components for everything from database connectors to anti-spam/virus integrations.
Visit halon.io to learn more!