I would appreciate you describing in detail this "collateral damage". If
it involves discarding of mail from the domain in question then it is
not collateral. What else do you have for us?
It's collateral to the extent that one's users complain about not getting
perfectly good mail. "Your friend's mail admins glorp plugh ADSP grungle
bleep" isn't a very satisfactory response to users. Pointing to
legalistic language in some web page with a three letter acronym won't
There's also the problems that have been noted with people bouncing off
mailing lists. Yes, in that case both ends are doing the wrong thing, but
if either did the right thing and forgot about ADSP we wouldn't have the
The sooner we stop wasting time trying to fix ADSP and start getting
shared drop lists, the sooner there's some hope of using DKIM to keep
simple forgeries out of peoples' inboxes.
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