Sending from Mail: Apple Support Communities
Thanks Ernie Stamper.
Quit Mail, and in the Finder open Home/Library/Mail/Mailboxes and locate the Outbox.mbox folder. Is there one? If you open it, does the Messages folder within it have any content?
Drag the Outbox.mbox folder from its location to the Desktop. Relaunch Mail, and attempt to send. Then in the Finder again, check to see if Mail has created a new Outbox.mbox folder, and to learn if this new message was in fact sent?
via Sending from Mail: Apple Support Communities.






