I'm running a single Exchange 2003 system, two virtual SMTP servers bound to different IP addresses (one accepts anon connections but only from upstream server, the other accepts from any system with auth reqd). Both virtual servers are configured to deliver direct, DNS servers are NOT listed in SMTP server config - DNS settings are configured properly on bound network adapter, external A and PTR records exist for both virtual servers. Server is behind a PIX running 6.3 with "no fixup protocol smtp"
I am getting outbound messages for certain domains, like aol.com, comcast.net, and a couple others, that just don't seem to go anywhere - other domains don't seem to have any problem. On my server, I can run nslookup to get MX records for affected domains and successfully deliver messages with telnet. I've tried re-applying Exchange SP2 to no avail.
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