Hope someone out there can help.
We are using a DMZ mail-relay host to relay all email inbound to an exchange
box sitting on an internal network and exchange keeps queueing mail for
delivery without actually delivering the email.
Using a firewall, mail.lac-harbor.org (188.8.131.52) maps to a Sun Ultra5
(192.168.5.80) running sendmail on a DMZ (SMTP traffic only permitted) which
(1) forwards email inbound to exchange server (10.0.2.109/184.108.40.206)
and (2) relays email outbound from that exchange server only.
Exchange users can send email between each other.
Exchange users can send email outbound to the Internet.
Exchange users are not receiving inbound email.
The active directory domain is lac-harbor.org.
The mail server is exchange.lac-harbor.org.
Under Administrative Groups -> Servers -> Exchange -> protocols -> SMTP >
Default SMTP Virtual Server -> Queues, it shows all the messages waiting.
The server queue reads:
lac-harbor.org (local delivery)
exchange.lac-harbor.org (remote delivery)
stage.lac-harbor.org (remote delivery) (another exchange box)
Why is exchange.lac-harbor.org noted to be remote delivery? This is the