jonlevine, glad it worked.. I was happy to get my mail app back in business too
gettheking, yeah. Any other app other than Mail doesn't seem to have the problem..just Mail. Sorry it didn't work for you.
BTW, did you try Plain Text w/out "windows friendly" attachments OFF? I don't use Windows Friendly attachments along with Plain Text and it works for me..but then I'm on 10.4.6.