Need a lean, mean Windows C++ mail client? This one needs TLC, but has the various elements which could be expanded into a real mail client. It can easily be adapted to run SSLEAY to access secure mail (I haven't released that version because I don't want to support compilation of SSLEAY or deal with restricting access to foreign predators).

The EXE is here. It is written in C++ and does not use non-native calls, though it was compiled with Visual Studio 200[58], so you might need to download some version of the .NET framework if you have not already done so.

The sources are here.