Problem sending emails with Mac Mail 1.3.11

Desperately in need of help. I'm able to receive but not send email using Mac Mail. I keep getting an error message:
"This message could not be delivered and will remain in your Outbox until it can be delivered.
The sender address [email protected] was rejected by the server"
I have already tried the following at the advice of AppleCare reps:-
Have verified & repaired disk utilities & keychains
Have reinstalled the operating system
Have trashed the mail.plist file
Have trashed the outbox.mbox file
Getting quite frustrated now because we have a mac bookpro with identical mail settings and it is able to send and receive mail without any problems.Could it be the version of Mail I'm running ?
I initially thought that the problem related to having switched to a new ISP but the fact that one of the mac's has no problem has led me to be less convinced of that idea.
Any suggestions gratefully accepted.
Many thanks

I am having the same problem exactly. I can read e-mail, but get the same error message trying to send it. I can't use .Mac anymore--have to use alternate e-mail for the last month--since some time in October 2006.
I haven't changed anything on my G4, haven't upgraded anything, and the problem started about the time .Mac reported some customers were unable to use Mail for a couple of days in October.
I see nobody answered your post. Did you ever get your mail to work? I have repaired permissions, but I don't think it has anything to do with that.
G4 Quicksilver 867Mhz 60GB   Mac OS X (10.3.8)   Maxtor 120GB internal; LaCie 150GB external HD

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