[Shorewall-users] URGENT: smtp problem

[Chris D. <ch...@cc...>]

First, the Shoreline Firewall is excellent. It was easy to set up and is
easy to maintain.

However, I have an urgent problem. In addition to the Shoreline
Firewall, I'm running Exim in hub mode on my firewall box. All email
going in and out goes through this box. Pretty much everything is OK,
except I have a couple of domains that I cannot send mail to.

If I'm on the firewall and I try to telnet to port 25 on the mx host for
the mail domain, I get "network is unreachable". I can traceroute to the
host in question.

If I'm on a machine *inside* the firewall (on loc), I *can* telnet to
port 25 on the mx host for the mail domain.

Something is very odd. Although it only happens with a couple of
domains, one of them is an important customer.

Any light that can be shed will be greatly appreciated.

Chris