On Sun, 23 Mar 2003, David Walker wrote:
As far as being easy to circumvent by spammers, the more you limit what they
can use in their fake headers the greater the chances they will have to use
real headers. Once they're using real headers sensible blocking and/or legal
complaints actually become feasible.
This point needs some expansion. Is the purpose of the proposal to allow
receipients to block on characteristics other than connection address? To
block only the spammers, and allow the legitimate mail to go through? Why
doesn't this have dangerous incentive effects, that is, MTA maintainers
will lose part of their incentive to block spam at the source because
their own legitimate mail will no longer be at risk of being blocked.
I can certainly see some ISPs giving up on spam control, and just telling
receipients that they should drop forged header mail rather than forward
it to abuse(_at_)(_dot_)
Daniel Feenberg
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