SM wrote: > Spam can pass SPF, Sender-ID and are even DK and DKIM signed > nowadays. One can't blame spammers for not being early adopters. :-) > TMDA may cause backscatter. After an SPF PASS the "backscatter" by definition can't hit an innocent bystander. By the same definition any "backscatter" after an SPF FAIL hits an innocent bystander, and therefore is net abuse. > http://www.ietf.org/internet-drafts/draft-ietf-sipping-spam-05.txt ) > provides an interesting insight. It certainly explains why [18]...[21] are unnecessary for SIP ;-) Frank _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf