Rumble
a Reasonable Uncomplicated Mailserver Bundled with Lots of Extensions
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Rumble - C/C++ API

Coming soon I hope, although if no one is intending to make use of it, it'll be written very slowly.

So, if you actually think you wanna write a C/C++ module for Rumble, gimme a nudge on the forum or at
humbedooh@users.sf.net