Stopping spam before it gets to you

[Gordon]

I've noticed that in most of the spam that makes it through the sender 
uses a from address of something legitimate like aol.com or msn.com or 
whatever. I already block email if the domain doesn't exist at all. Can 
anyone tell me if it's possible (any prefereably how) to have sendmail 
reject the connection if the from address is aol.com but the mail server 
isn't aol.com (likewise for msn, yahoo, etc.).

Gordon

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