Unusual Problem Sending Email

[Carl]

Hello, Just trying to get a little input on an unusual email problem...

I am pretty sure it is an outlook problem but the environment is SBS 2003
SP2 and XP pro, Office 2003 on workstations. All are current with updates

This involves one workstation out of 30. User can send emails to everyone
except one domain. Any recipient at that domain never receives the email, the
receiving server never gets any notification and the sender never gets a
failed notification. The email appears to send and it can be found in the
sent mail folder.

I think I have narrowed it to something in the users mail profile because I
can log on to his workstation with my profile and send to the domain and I
can log him on to a different workstation and he can send to the domain. So,
I created a new email profile for him on his workstation and that resolved
the problem.

Except, that was three days ago and now it is doing the same thing. Have not
added any hardware or software or made any other changes in those three days.

Any ideas on what might be happening here or suggestions on troubleshooting
the problem??

 

[Carl]

Ok I figured out the problem but still do not understand why it is doing it

I talked to the user and the only thing he had done since the new profile
was create his signature again. So, I disabled the signature and it works
perfectly. I added it back and it fails. I then deleted one line at a time
and found that the line that includes the company internet address is causing
the problem.

I can use domainname.com but not www.domainname.com

He and everyone else uses this same signature and there are no other
problems except when he sends to one particular domain

I searched the internet and found several others with similar problems but
no resolutions

I would be interested if anyone has a clue on this one??