How to detect forged From and Reply-to addresses from your own domain

[Daniel Straka]

We are receiving a ton of SPAM where the From and/or Reply-to addresses have been forged so they appear to have come from users in our own domain. Of course, these BC several users at a time. Is there any way to detect these with MailScanner?

Thanks,

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Dan Straka
Systems Coordinator
Casper College
307.268.2399
http://www.caspercollege.edu