OT Sendmail Question

[Tracy Greggs]

I would like to be able to configure sendmail so that any incoming mail from
any.user at mydomain.com that is addressed to any.user at mydomain.com (local
delivery) 
would only be delivered if SMTP Authentication is successful, unless the
sender
ip is allowed to relay in my access.db

Any suggestions would be greatly appreciated.  
As this post is OT, reply directly if you like.

Sorry for the OT post, I have my fireproof suit on :)


Tracy Greggs 
Oklahoma Network Consulting