Greetings, I am having problems with the Exchange 2000 SMTP Queue, mail is stuck in the queue, eventualy a NDR Report is delivered. Background: Exchange 5.5 Server Different Domain, functions properly New Exchange 2000 Server seperate new Domain Both Exchange Servers go through the same router the router has all needed ports for Exchange 2000 to function Mail flows correctly from the old Exchange 5.5 server If old Exchange 5.5 server is turned of mail from the new Exchange 2000 servers still remails stuck in the queue I have checked and Port 25 is open Are there any other things I should be checking? The Exchange 2000 server passes the DNS test Justin Maas