On Tue, 4 Mar 2003, wayne wrote:
Spammers don't care about undelivered spam. Most of the time, they
won't even know because they use open proxies, forged from addresses
and forged reply-to addresses.
However, there is a benefit to replying to spam with a 554 SMTP code.
If the spammers have been using an open relay, the open relay will generate
a bounce message that typically bounces, causing mail to go to
postmaster(_at_)open-relay(_dot_) This provides some incentive to close open
relays.
--
David.
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