SMTP Rejections V Undeliverable Email

I was listening to a very riveting Exchange server podcast recently and heard the guy say :

"In today's hostile e-mail environment its recommended that messages are not rejected with bounces where possible but with SMTP rejections. That way the reject error goes to the computer which started the SMTP session, not the spoofed sender."

Can someone explain to me how to set this up ?

Thank you
pbgormleyAsked:
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redseatechnologiesConnect With a Mentor Commented:
Hi pbgormley,

That is recipient filtering and tarpitting (which came in with Windows 2003)

http://www.amset.info/exchange/filter-unknown.asp

Out of interest, what podcast was this?

-red
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pbgormleyAuthor Commented:
Cheers -red,

Cant quite recall, I use Juice for collecting podcasts, It may have been one from the TechRepeblic lab
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