Problem sending e-mail to certain domains from SBS 2008 Exchange 2007

I receive the following error when I try sending to a certain ISP ( #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##  
I am not sure where to start to try to fix this problem.  
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jeffreychorbaConnect With a Mentor Author Commented:
Found problem to be I needed reverse DNS setup
jeffreychorbaAuthor Commented:
I looked at both articles in the above post and neither of them apply?  Anyone else have any idea?

jeffreychorbaAuthor Commented:
Looking for some help on this topic!
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