sendmail

My sendmail is suddenly accepting email for everyone and anyone and I can't
find any changes. It is set to accept mail for relay from 192.168.1 which is
all my internal machines. No other relay is allowed, but all of a sudden it
is accepting messages for aol and some others. Internal machines have been
disconnected and it is still accepting from the outside world.

How do I get sendmail to verify a valid user before accepting the message?
Most of the messages it is accepting is for invalid users at my domain and
then delivers them to root.

I am probably going to switch to postfix because of this, but nonetheless I
would like to know how to fix this. As sendmail is still used big time, I am
sure there is a way around this, not just an easy fix of dumping it and going
somewhere else.

Any sendmail geniuses?

Nathan
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