how to restrict systems/users to use sendmail server?

Is there any other way to restrict users/systems/domains/IPs to use sendmail server except listed in /etc/access(.db)?
I just want to secure sendmail server so that none of the other system can send mails/messages/spams from sendmail server except we have mentioned the IPs of LAN systems in /etc/access.db.

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ltxdaConnect With a Mentor Commented:
Here is another, more advanced configutation how-to's:    <-  I think this one is more what you're looking for if you don't want to settle for just SMTP Auth.

Hope this helps!


You can configure Sendmail to utilize authentication and not relay unless a user has been authenticated.  Check the relaying configuration portions of the docs and also AUTH.  
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