[cobalt-users] Outoing SMTP dead - Incoming POP appears OK

["C Burchell" <chris@xxxxxxxxxxxxxxxxx>]

The SMTP service on my RAQ4 appears to have died.  Incoming mail from thet
Internet appears to be working fine, as my clients can pick it up... but
whenever they (or I - on the same network as the RAQ) try to send mail
through the server (as and SMTP server, which we've always done) they get
timeout messages.

I do not know sendmail very well, but a quick glance at mailq reveals a
whole ton of messages with a whole bunch of (host map:  lookup (domain.com);
deferred) error messages.  There are 4 mail queues under
var/spool/mqueue  - all of which are full of 50-200 messages in each   - all
with the same error.

There were some minor DNS RR changes made recently as a result of an ISP IP
change, but these changes should have all propogated by now - nslookup and
ping tests of many name servers (and from diff. ISP networks) reveal this is
true.

Is there any way to kick-start sendmail again?  Has anyone seen this before?
Any ideas on how to fix this?

Any help would be appreciated.

Chris