Then there's this, built on top of the protocol: https://bitmessage.ch/ https://bitmessage.ch/ The source code is here: https://github.com/AyrA/BitMailServer

Then there's this, built on top of the protocol: https://bitmessage.ch/ https://bitmessage.ch/ The source code is here: https://github.com/AyrA/BitMailServer https://github.com/AyrA/BitMailServer It's written in C#, which I don't personally like. And there's no mention of which particular 'open source' license it is. But the source code should be informative for a port/rewrite, and maybe running it via Mono is viable. edit: If the DarkMail people happen to be reading this thread, please consider putting your full support behind BitMessage.