On Wed, 2012-06-27 at 11:26 -0400, Bruce Bowler wrote:
> root@nurse:/etc/exim4/conf.d# netstat -anp | grep 25
> tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1134/exim4
> tcp6 0 0 ::1:25 :::* LISTEN 1134/exim4
It's not listening externally (those are the IPv4 and IPv6 "localhost"
addresses).
You should configure your Exim install on NURSE to listen externally,
perhaps by commenting out "local_addresses" or running the appropriate
dpkg-reconfigure incantation for your installation (you did say it was
Ubuntu).
You may also need to poke a hole in your iptables ruleset.
Graeme