Mail quits after Group Address
The Crash report says something like that it doesn't like my Group Address. Initially it would work OK until I tried to use the Group Address, but now it looks as though it may be trying to send a Group Addressed email on opening Mail as it immediately quits. Is there a way of seeing waiting emails or the Group Address folder so that I can delete it without opening Mail? Mail quits immediately on opening so I don't see Mail at all.
Mac Pro, OS X El Capitan (10.11)