Currently Being ModeratedNov 19, 2012 11:20 AM (in response to TeriPick)
I'm haivng the exact same problem!
"Quit Mail" is simply greyed out, and only occurs after I've tried--obviously unsuccessfully--to QUIT MAIL.
It doesn't happen terribly often, but when it does it is beweildering. Especially because using "Force Quit Applications seems to be the only solution, but even that doesn't say that the app isn't respond. The app keeps working, and lets me open other windows.