My original posting (which is too long to repeat here - but I'll
gladly send to anyone who missed it) asked for any hints or pointers
that we can use to figure out where to look in DNS/NIS/Sendmail Rules
for the reason why our central mailhost all of a sudden started dropping
part of the address for delivery of mail to some machines within our
campus domain, but not within its subdomain, e.g.
--------------------------------------------------------------------------
nps.navy.mil% cat testmsg | mail -v 0085p@vm1.cc.nps.navy.mil
0085p@vm1.cc.nps.navy.mil... Connecting to vm1.nps.navy.mil via ddn...
0085p@vm1.cc.nps.navy.mil... Host unknown
Saving message in /usr/home/alschoen/dead.letter
/usr/home/alschoen/dead.letter... Sent
nps.navy.mil%
--------------------------------------------------------------------------
where nps.navy.mil appears to think that vm1.nps.navy.mil is the
legitimate destination address for mail to vm1.cc.nps.navy.mil. I
can't figure out why it's dropping the "cc"!!
Unfortunately, I only got one response. That suggested we drop Sun's
bind and sendmail in favor of the Berkeley versions. I appreciate the
advice (and apologize for misplacing the name of the sender), and, while
that may well be our long-term solution, it's not feasible right now.
But, I'm still as much in the dark as I was at the outset as far as
what caused this specific problem to just start appearing.