Hi,
I have major problems relaying outgoing email via smarthost after I installed Exchange 2003 SP1. Exchange can't relay outgoing email to our SMTP gateway (smarthost) after the upgrade. Exchange can send email fine by itself if I remove the smarthost. Incoming email is working fine with and without the smarthost. What is happening is that Exchange is making the connection to the smarthost and then conneciton just stays for as much as 800 seconds. I might have 5-6 connections from Exchange server in the current session on the SMTP (smarthost) gateway server. No email is every delivered to the SMTP gateway and everything gets stuck on the Exchange server. No error message in the EventViewer on Exchange or the SMTP gateway. I am not kidding, there is nothing at related to SMTP or DNS or anything that could have anything to do with this problem in the EventViewer. I also installed the latest service pack on ISA 2000 (firewall, different server) the same day, but I don't think it has anything to do with as a) exchange can send email by itself b) the ISA rules for both servers are identical. Both the SMTP gateway and the Exchange (2003) server are running on Windows 2003.