Exchange 2007 NDR

Posted on 2008-10-22
Last Modified: 2013-11-30
Two examples of error message below... #553 5.3.0 nlpi091 - m9MISBuE005317, DNSBL:521< >_is_blocked.__For_information_see_ ## #550 Relaying denied ##

We are getting the above error when sending email to a few email addresses. Any idea as to why this is happening. We just upgraded to Excahnge 2007 and did not have this problem on Exchange 2003.
Question by:dtarra
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