From: Valdis(_dot_)Kletnieks(_at_)vt(_dot_)edu
Bulk-mailers as senders are a small enough scope that forced upgrades
within a grace-period window is feasible.
The people that are the problem have a horrible tendency to not follow
the *CURRENT* RFCs (things like ignoring MX records, syntactically borked
MAIL FROM:, the whole gamut).
What makes you think they'd upgrade to software that would diminish their
ability to spam people who didn't want to be spammed?
See also standards track RFC 2919 which is supposed to identify bulk
mail and which this mailing list does not follow.
Vernon Schryver vjs(_at_)rhyolite(_dot_)com