hello.. my mail is frozen and i cant receive or send emails because a very large email I had as a draft and tried to delete is still stuck sending... every time I try and log out of mail and back into mail, it is still stuck sending.. but it doesn't appear in my outbox or in the sending folder, so i can't move or delete it... HELP!
You should quit Mail if it's running and open ~/Library/Mail/<account name>/Drafts.mbox (and/or INBOX.mbox) and look for that email you tried to send, then delete it; or if Delete doesn't work, Cut it (Command-X). Then restart Mail and see if things are back to normal.