I am having difficulties sending mp3s, via email, to a friend. I have a PC and create mp3s using dBpowerAMP, she has a Mac. If I zip them she cannot open them, so I reduce the quality, sometimes she can play them once but mostly cannot play them at all.

This is the exact opposite of the problem that I have with another friend who can only receive them if they are zipped.

Has anyone else come across this problem before, is it a PC vs Mac thing and what is the best way round it?

Regards

Chris