WinUAE and YAM

[KennyR]

YAM can do this even on a real Amiga, especially on slower connections like 56k modems. YAM is quite stupid when it comes to this requester - cancel never works in these deadlocks.

Have you tried a more recent version of WinUAE? Older versions had badly bugged netbsd.library emulation.

[KennyR]

MOS has no bundled mail client, but most folks use a native MOS compile of YAM, which is very stable.