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Re: [Asrg] Spam detection system proposal

2003-03-05 08:59:34
On Wed, 5 Mar 2003, Keith Moore wrote:

In order to remove bad addresses (as Justin Mason pointed out), or
honor unsubscribes, spammers would need to supply either a valid
return address or a Web page somewhere that's trackable.

yes, but they don't have to use the same return address or web address
for subsequent spam.  thus the value of this identifier in blacklisting
them is near zero.

Consider:  To receive DSN notifications, the spammer can expect to receive
between 10-20% of all the mail he sends out.  Sending 1,000,000 messages to
different addresses is cheap.  Receiving 100,000 to 200,000 copies of that
same message to a single address (or even a few addresses) is not.

If the spammer doesn't want to receive the message body in the DSN's, he
or she will have to use a bulk precedence header. :-)  To reduce his own
costs, the spammer is forced to play nicely.

--
David.
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