I just saw this recently submitted draft and don't recall it being discussed in the recent spam thread, so thought I'd point it out in case people hadn't noticed it: http://www.ietf.org/internet-drafts/draft-danisch-dns-rr-smtp-01.txt (Note: I am stating no opinion about its applicability or effectiveness) -- Cos (Ofer Inbar) -- cos@aaaaa.org http://cos.polyamory.org/ "OSI is a beautiful dream, and TCP/IP is living it!" -- Einar Stefferud <Stef@nma.com>, IETF mailing list, 12 May 1992