There's a proposal under discussion in SPAM-L to establish a MAPS-like blacklist for "open-loop" lists. What this really means is anybodies guess, but I've confirmed with the author that a Listserv list with "subscribe=open" qualifies... *even if send= [log in to unmask]* because a subscription could be forged and the valid postings would be UBE to the victim. What I'm unclear of is, what are the effects of the DISTRIBUTE mechanism in all of this? Do Backbones (in the worst case for this scenario) distribute to regions/domains outside of themselves? In terms of _risk_ could an inept postmaster see [log in to unmask] being delivered via some IP of a regional backbone outside his own domain and accidentally cut off all lists distributed through that site to his own domain? And, yeah... I think this is an insane proposal for a lot of reasons aside from this one, but right now I seem to be on my own. -Kary Note: Really. The author is insistent that the blocking be done by IP without *any* information about the mail being blocked being available to the blocker. As an aside, SJU doesn't dictate to its owners how they "should" configure their headers, so a single "impure" act on any one of our lists will result in cutting off the other 600+. This whole thing sounds like a stupid prank by a Troll to me, but nobody else seems to be commenting against it.