> My machine is a part of a network which has NIS but not DNS.
> Everything was working fine with RedHat 5.2 default sendmail
> configuration but after upgrading to 6.0, everything went for
> a toss. Now, for every mail that I send to the other hosts on
> the network, sendmail tries to lookup the target host from DNS,
> failing which, it queues up all the mails in deferred state.
I had a similar problem. I gave sendmail an additional option:
-o DeliveryMode=d
but you might want to check this in the man page first.
Good luck
