Exchange delivery will fail if the DNS query fails. If you have slow DNS it might be better to configure your IMC to route all
your outbound mail through your ISP's mail host. They don't even have to configure anything! You just put the IP address (not the
DNS name) into the "Forward all messages to host:" box on the Connections tab of the IMC Properties page. Now the IMC won't even
bother with DNS. It will simply send the message out via the IMC to the ISP and let it deal with final delivery and DNS
Simpler-Webb, Inc. Austin, TX 512-322-0071
"The clue meter is reading zero..." - Dilbert
> Are site has a new Exchange installation version 4.0 with service 2 & 3
> installed. Exchange is running on NT Server 4.0 with service pack one.
> The NT server is a Pentium 90Mhz with 48 MB of ram.
> I setup the Internet mail connector for our organization and everything
> is working except that outbound internet mail messages come back
> undeliverable about 50% of the time. Our DNS is slow. I want to know how
> Exchange handles DNS. Does it timeout if it doesn't resovle a name in x
> seconds? If so can I expand it? I think its a DNS problem timing out,
> but I could be wrong.
> Any ideas would greatly be appreciated. If possible can you also