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Loren Wilton writes:
> > I don't see the advantage of this. How does a *message header* help in
> > tracking? Or does it correspond with a web bug?
> 
> List washing.  When they actually get a complaint about spam, they can
> remove the address from the list, even if the report is something like
> Spamcop that attempts to remove any identification of the complaint sender.

this used to be quite common (haven't looked at much spam in detail
recently ;)  Also seen in link uris disguised as referrer IDs,
and encoded in HTML comments.

- --j.
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