Suddenly can't send email... what happened?

Using Mail on Leopard. I can receive email just fine. But sending it...
I get the error:
"Cannot send message using the server (my server name)
The server “mail.mydomain.com” rejected the address “[email protected]”.
Select a different outgoing mail server from the list below or click Try Later to leave the message in your Outbox until it can be delivered.
Sending from: My Name <[email protected]>"
I've never seen the "rejected the address" before. And doing a search on Discussions turned up ZERO threads.
Any ideas? Please help!
Cheers.

I was having lots of problems yesterday with Mail. First it was my .mac mailbox then my 2 gmail accounts. I went into one of the gmail accounts and it was not set to 'imap' which is how mine is set up. Everything has worked fine for weeks, and all of a sudden settings are changed. Preferences are not being saved either - I'm having to reset them a couple of times a day and I'm sure to check the 'save' box too. Why would a setting in gmail settings change? It seems that gmail and 'mobile me' don't get along either! I ended up deleting both gmail imap accounts, and recreating them. So far, they have worked today just fine, but folders keep appearing and disappearing in the mail client. Earlier today the 'reminders' folder was there - now it's gone. Not that I use it, but that's another example of the inconsistency we're experiencing right now.

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