exchange server problem - very odd

Our Exchange 5.5 server is receiving mail from everywhere without any type of problem.  Everyone can also send external email no problem at all with one exception - 3 employees who send emai lto a specific company (example: joe@school.edu) can NOT send out external mail but ONLY to that domain name (@school.edu).  The same users with this problem can send mail everywhere else without issues.

Any ideas on this one?
rjmaht2000Asked:
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geoffrynCommented:
Check the Exchange Administrator for Delivery Restrictions.  It sounds like you have some set up.
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mikecrCommented:
Sounds like a firewall issue most likely. Are you getting any rejection messages or administrative messages on those workstations having the problem and what are they?
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geoffrynCommented:
Do you have delivery restrictions set in Exchange Admin for those users?
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rjmaht2000Author Commented:
error messages read "server unable to accept messages"

However, I am puzzled as to why it is only the addresses at the one address.  They had no problem sending mail to the same address previously.  However, on the boxes with the problem, the IP Addresses changed from DHCP to static -172.21.11.* addresses to a 172.21.12.* addresses - but they are all within the same subnet so it shouldn't matter - should it????
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mikecrCommented:
Is the error message your receiving being sent by the server your mail is going to or your own server? If it is your own then I would have to agree with Geoffryn's comment.
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rjmaht2000Author Commented:
No restrictions are set on the Exchange server at all.
Mail is going out and coming in.
A select few can not send mail to specific addresses for some odd reason.
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