Why does Mail 5.2 suddenly not send emails? SMTP servers are correct
I have 3 email accounts in Mail 5.2 each with their own SMTP server. The SMTP servers were untouched for years, and always worked. The settings remain the same. Why all of a sudden can I not send out emails? They just stick in the Outbox. Again, no settings were changed, and now I have to access webmail for all of my accounts. I'm running OS X 10.7.4. Connection Doctor in Mail indicates that the servers are working properly.
The only I can think of that changed a couple weeks ago was my Keychain settings. Not have any other issues with Keychain, but wondering if this could be having an impact.
MacBook Pro, Mac OS X (10.7.4)