Error message 'sender address rejected by server' w/MacMail

I receive email ok but all of a sudden I cannot send email or reply to email using Mac Mail. The error message says:
Message could not be delivered and will remain in outbox,
The sender address xxx@xxx was rejected by the server.
What's up Apple server?
Thanks
Chas
G3 B+W 450 Rev.2-ram 448mb-OS X on Cheetah disk   Mac OS X (10.3.9)  

The security update didn't break any of my email accounts and I access several with Mail that are not provided by my ISP.
Is this email account you were having problems sending messages with provided by your ISP - AT&T or other?
I have a .Mac account and I also access my employer provided POP account with Mail and although I have no problems sending messages with either account and associated SMTP server since both SMTP servers are authenticated and my ISP does not block the use of SMTP servers that are outside of their network or not provided by my ISP on Port 25 as long as the SMTP server is authenticated, I use my ISP's SMTP server to send messages with both accounts when connected to my ISP at home.

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