I think the concern about this benefiting spammers is a little overblown. I
do not see anything in this draft that would cause any of the existing or
planned anti-spam techniques to be circumvented. Neither does it seem likely
that a spam outfit would be able to use this service extension to much
positive effect.
uh...if someone complains about a spam, then it's currently quite feasible
to search mail queues and message stores for identical messages (after the
received lines), and remove them. if every spam is slightly different,
this becomes much more difficult.
Keith