https://bugs.winehq.org/show_bug.cgi?id=17276
--- Comment #9 from Rosanne DiMesio dimesio@earthlink.net --- My email client (sylpheed) is set to auto-detect the encoding, and I haven't had any garbled characters in emails from the AppDB.
The header on the AppDB emails I've received say "MIME-Version: 1.0", and according to https://en.wikipedia.org/wiki/MIME that's exactly what it should say to indicate that a message has been MIME-formatted.