Sendmail: Deferred: Name server: xxx.xxx.xxx: host name lookup failure

[Chuck Swiger]

Bas Hendriks wrote:
> I have a problem with one of my servers,
> Suddenly i am getting a lot of "Deferred: Name server: xxx.xxx.xxx: host 
> name lookup failure" while DNS resolving on that box is ok(from the 
> command line de backend servers do resolve and are reachable). The mail 
> stays in the mailqueue.

That's normal when a spam-run drops a lot of mail in the queue before someone 
at the registrar yanks the DNS registration.  You can manually flush the queue 
with a shorter or zero retry interval to clean up the queue of this stuck mail 
via sendmail -q....

-- 
-Chuck