For Linux and Windows - SlyMail provides a full-featured interface for reading and replying to messages from BBS (Bulletin Board System) QWK mail packets. Its user interface is inspired by Digital Distortion Message Reader (DDMsgReader) for message reading and SlyEdit for message editing, both originally created for Synchronet BBS. Would you like to know more?
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https://github.com/EricOulashin/SlyMail]
https://github.com/EricOulashin/SlyMail