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Recipient address rejected: Access denied

I have an SBS2003 server with Exchange setup using the POP and SMTP Connectors.  Users are sending and receiving emails just fine except when sending to non-Exchange users with the same email domain.  Example:  user@myemail.com sends to externaluser@myemail.com.  I found this article on Microsoft that addresses this exact issue http://support.microsoft.com/kb/300681.  I am not updating users with Recipient Policies as this was causing a problem with changing the Reply To email address.  I entered the ISP's mail server where the article tells me to as ISPMAILSERVER.COM and are no longer getting the error message and emails are gertting sent out from Exchange but are never received by the recipients.  When I change the ISP's mail server to SMTP.ISPMAILSERVER.COM, I get the error message in the title "Recipient address rejected: Access denied".  The ISP Mail server requires authentication on their outgoing email so I am assuming this is the cause but I don't know where in Exchange to enter login credentials to allow emails to get through.  
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cjanus0927
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cjanus0927
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3 Solutions
 
cjanus0927Author Commented:
Thanks for the info but I am not trying to relay all my email through the ISP''s email server.  I have everything setup and working right now.  It is only when I try to send email to non-Exchange users of the same email domain that I ma having trouble.
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MesthaCommented:
Sounds like you are trying to share the SMTP address space. This KB article covers that:

http://support.microsoft.com/kb/321721

Simon.
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cjanus0927Author Commented:
I found the answer I was looking for on Microsoft.  Adding a second Recipient Policy is what solved the problem for me.  This was in the original KB article I posted covering Method No. 2.  Thanks for your responses.  
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