Getting email from private network to internet via sendmail

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To: <sunmanagers@sunmanagers.org>
Date: Fri, 25 Jul 2003 15:41:21 -0500

Managers,
    I have several Solaris 8 machines on a private, non-routable network
from which I need the ability to send email to the outside world. One of
the hosts on that network is a bastion between the private network and the
public network. This host is running sendmail and uses the DS (smart relay)
option to direct all of its email to our email gateway. Mail sent directly
from the bastion host to the outside world works without any problems.
However, email sent from any of the hosts on the private network addressed
for an internet host winds up queuing with the following error reported by
mailq.

                /var/spool/mqueue (2 requests)
----Q-ID---- --Size-- -----Q-Time----- ------------Sender/Recipient---------

---
h6PK9bi00334      543 Fri Jul 25 15:09 abelk
                 (host map: lookup (usm.edu): deferred)
                                       allen.belk@usm.edu
Each host on the private network is configured with the DS option in their
sendmail.cf file that points to the bastion host.  I am not a sendmail
expert and am not sure if the DS option is what I should be using in the
first place.
I am also running a private caching-only name server on the bastion that
provides name services to the private network only.  I do not have MX
records for the private hosts but have seen some articles on the web that
suggest using a single wildcard MX record for all private hosts.  I have
tried this without any success.  If anyone out there has had experience with
this type of configuration or has some words of wisdom to impart, please
email me.  Your help is greatly appreciated.
Thanks,
Allen
 | Allen Belk, Systems Administrator III
 | University of Southern Mississippi
 | iTech, Technology Infrastructure Unit
 | allen.belk@usm.edu  -  601.266.5973
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