I had a quite strange issue. About a week ago my bind9 broke down and I
could not get it running again on the same machine. So moved it to
another machine and changed the /etc/resolv.conf of my machines to try
both IP. Apparently everything worked fine.
Today I was puzzled that the corresponding bug-report to the Debian list
was somehow missing. I resent it watching the postfix logs and found
that potfix was missing the MX entry of my relay host and refused to
send. Since the host itself actually does not have a MX entry, I was
sidetracked assuming postfix was not smart enough to strip the host name
from the domain. During this trouble shooting I had postfix reload its
configuration a couple of times. After setting the name in [] postfix
reported that the A entry was missing, which definitely was wrong.
I restarted postfix and voilá it continued working like it did all the
years before. Now I know that it is smart enough to strip the relay host
name from the domain to lookup MX. ;)
Apparently postfix missed the switching of nameservers and did not learn
of the new DNS until restart. Is this a bug or a feature?
Postfix Version: 2.5.5 (Current Debian stable)
Regards,
- lars.
