[Spambayes] Bouncing Spam
Wed Nov 27 03:40:15 2002
From: Tim Stone - Four Stones Expressions <tim@fourstonesExpressions.com>
This is a bit off topic, but perhaps someone knows... Is it
possible to return a mail in such a manner that it appears to the
sender to have bounced? It'd be real nice to have a 'bounce'
option for spam, so that the senders *might* take the address off
their list, if they think it's a dead address...
Yes, BUT you have to be the program sitting on TCP port 25, which
means a privved program, or at least a trusted one.
You certainly can fake a failed address by returning a code 550 in
response to a "rcpt to" command from the other end.
Read the RFC (I think it's RFC-2822 but not sure) for the
permissible error bounces, and when you can send them. All 5xx codes
are errors of one form or another, and I believe that code 550 is
"user unknown". However, some implementations may get very
annoyed when you pop a 550 response any time other than after "rcpt".
There _are_ other 5xx codes you can use that generate bounces,
but heck, give it a try. The worst thing is... the mail may
Maybe I should... code this up? :)
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