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Can't Send Msg's Exchange 2003 (2003 small business edition)

i just setup a exchange server and i can receive mail just fine but when any user tries to send a email msg (to anyone) we get the following msg.

There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
  <domainishere.com #5.5.0 smtp;550-5.7.1 [Extrnal ip address is here] The IP you're using to send email is not authorized > 


Could it be a problem with my ISP.. it is AT&T by the way..... I also tried to change the delivery settings in the SMTP virtual server and that didnt work .. What could this msg mean?
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ncotton
Asked:
ncotton
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1 Solution
 
isaman07Commented:
It means your ISP is blocking outgoing port 25. Contact them to make sure.
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ncottonAuthor Commented:
That is what I was thinking. I will contact them when they are open for questions.. lol
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isaman07Commented:
BTW, just curious, do you have your DNS configured properly? Like do you have your MX record set in your DNS?
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ncottonAuthor Commented:
Yeah I have a MX record.
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