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That's exactly
right. Sending unsolicited mail to innocent third parties makes you a
spammer. With the rampant use by spammers of trojaned Windows boxes on
broadband networks that do not restrict outgoing port 25 access, it is virtually
impossible to determine in an automated way the true source of the
message. In many cases, it is impossible even by skilled sysadmins.
The actual sender is only acting as a remote controlled proxy for the spammer,
and there may not be any trace left in the message of the identity of the
spammer.
Even if you could
determine the true origin of a particular piece of spam, creating a fake
"bounce" after your incoming MX has accepted the message is a very bad practice
and will not accomplish anything. Messages can only be bounced by
bona-fide mail receiving systems (MTA's), not end-user mail clients
(MUA's). Bounces use special provisions of the SMTP protocol that only an
MTA can do. It will be obvious at the receiving end of the "bounce"
that it is a forgery by an end-user MUA, not a real bounce from an
MTA. Such a forged bounce will be simply ignored, and is actually
proof that the spam was delivered. If anything,
you have just confirmed that your address is live and you did receive the
spam.
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