Mail started quitting a few days ago, just after it starts. I tried everything that has been suggested for these cases: removed beta version of Safari, remove Growl and any other third parties, remove the preferences file (.plist) and the user/Library/Mail folder. Nothing works! I set up another account on my Mac and Mail works there! I tried to use the new files that Mail generated for this new account for the old account but I couldn't make Mail to run. Any help is appreciated.