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Unable to send emails to domains

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We are running Win 2003 SBS with Exchange. We are having problems sending emails to certain domains. A NDR is received when sending to these domains. This happens with all email accounts in our system. We are able to receive emails fine from these domains. Here is a copy of the NDR: Your message did not reach some or all of the intended recipients. Subject: XXXXXX Sent: 8/20/2008 9:51 AM The following recipient(s) could not be reached: XXXXXXX on 8/20/2008 9:51 AM You do not have permission to send to this recipient. For assistance, contact your system administrator. <XXXX.XXXXX.com #5.7.1 smtp;550 5.7.1 Unable to relay for XXXX@XXXX.XXX>

Retreiving emails from ex...

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