Mail suddenly stops sending out messages.

I use Mail with Snow Leopard. I have 3 email accounts: U-verse, MobileMe and godaddy.com. Up until last week everything worked just fine. Then Mail stopped sending out messages on all three servers. They just sit in the Outbox. I can receive messages OK. I can go online and use the associated webmail sites. Connection Doctor gives me green dots on all accounts. Have not changed any settings although I did confirm they are configured properly. What the heck is going on?

That means nothing is wrong with Mail itself. The problem lies in your data. Mail is a very complex application with a lot of files. Rather than going through a long diagnostic process, I suggest you make a record of all your account settings, quit Mail, move your Library/Mail folder to the Desktop, delete the file Library/Preferences/com.apple.mail.plist from your home folder, and start over with a clean slate. Set up your accounts as if for the first time, test, and if all seems well you can restore your messages either from Time Machine, if you use it, or by importing them from the old Mail folder (File > Import Mailboxes...). It will take some work, but I don't know of an easier way. Make sure you have backups of everything before you start.
If you do use Time Machine, you have the option of restoring all the Mail files from a snapshot that predates the issue, but then you'll also have to find and restore the messages created since that time.

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