Configuring mail server to prevent "spoofing" of internal mail addresses.
Posted on 2006-10-27
My company just went through an internal vulnerability assessment and one of the recommendations was to configure our 2003 Standard mail server (not exchange-it's for internal use only --employee and application notifications-- and not external email) to prevent someone from the inside telnetting to port 25 and using the helo command to "spoof" an employees email address to send mail to other employees. I am not finding a way to do this at all. Any help would be greatly appreciated, this is driving me insane :) I have to come up with a response for this other than "this is a serious problem?"