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sendmail and NOQUEUE: Null connection from root@localhost in log files

We were alerted to some of these messages in the log files and found a page where some
CERT folks described discovering a root hack on their box and these messages in the log
files. None of their other symptoms seems present on my box, though I do have a decent
number of these NOQUEUE messages, sometimes saying from root@localhost and other times
with ip addresses or resolved hosts... I have sendmail: LOCAL in my hosts.allow and ALL:
ALL in hosts.deny, so I'm wondering how to better prevent what looks like failing
connections to my sendmail server, maybe I'm just confused though..
thanks for any insight.

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