Hi. I have Exchange 2003 running on a SBS server and all of a sudden some emails stopped sending. Most emails send as normal but just a small number of domains sit in the queue. I can ping the domain address and it does resolve the name so I'm not sure whats wrong. Any ideas? John

The suspect domain names may have valid IP addresses but they need to have an MX record in the dns tables. To check, use something like www.domaincrawler.com.