Well, we do that for a reason... it sends spammers to the next (unreachable) MX point after failing to send spam to the primary. I used to use 127.0.0.1 - but people like SBC block incoming mail if the remote's have any MX's set like that (poo!)...
I've started using a real address in my net block that I know is not in use and won't have a mail server listening. Do any spammers search backwards and use the first listening server? In that case, this will cause the first TCP connection attempt to time out, which should chew into their resources.
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