Ok, I have fixed the issue or it fixed it self. I am running ISA Server also and found an article about setting up a rule for DNS on an ISA Server. After doing this messages started going out. Here is the link in case someone needs it...
How did you correct the DNS error? Did you setup a smarthost? I am able to ping the domain(s) in question and have changed the DNS servers I was using.
How did you correct the DNS problem? Did you setup your ISP as a SmartHost? I've changed the DNS servers and can ping the domains that are having issues sending mail to.
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