On May 24, 2010, at 6:38 PM, John Levine wrote: >>> Refusing signups from those domains is probably a bit extreme, though. >> >> What about a warning at signup time if a "discardable" ADSP record is >> found for the registrant's domain? > > That doesn't help. In the IETF's scenario, domain A sent mail which > was marked discardable to the list, and recipients at domain B were > rejecting it and the people at B got bounced off the list. I'd have > to squint awfully hard to come up with an argument that it is wrong to > reject unsigned discardable mail at SMTP time.
I think that Murray was suggesting that in addition to rejecting all mail from domain A it would be polite to also warn anyone from domain A who subscribes to the list that their mail would be rejected (which seems good UX design to me). > > Since ADSP causes problems for innocent bystanders, I think it's > reasonable to decline A's mail in the first place. This is doubly > true since the ADSP RFC rather specifically says that you shouldn't > mark a domain discardable if its users send mail to lists. It causes no problems at all to innocent bystanders in that case - the recipient at domain B is a willing participant who has chosen both to pay attention to ADSP and to respond to it by rejecting, rather than discarding, mails labeled "discardable". Cheers, Steve _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html
