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SirMoby: Even if a server isn't accepting mail back, it still has to handle the REQUESTS for the mail to come back. That means that the level of network traffic BACK to the source of the spam could effectively remove half or more of their available bandwidth (it gets worse if they bounce bounces).
It could get MUCH worse if all of the links inside a spam message are loaded and "checked" be the program for each email sent... most spammers couldn't handle the 22 million page verifications... they would die.
While in the short term network traffic would go up, it would almost certainly make it MUCH more difficult to make money from spam.
As a side note, most of the "hardcore spammers" I have known in the past have moved on to other things, the return on effort in spam isn't what it use to be.
Alex
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