Re: [Asrg] Spam detection system proposal

["David F. Skoll" <dfs@roaringpenguin.com>]

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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