I doubt I will post to the ietf-mxcomp, but here is my opinion on how others
might want to try to refute these:
I changed my mind and decided to post to ietf-mxcomp:
http://www.imc.org/ietf-mxcomp/mail-archive/msg04008.html
"SenderID for the greater good?"
"...The larger question though is the greater good helped more than hurt? IMHO,
anti-forgery (especially per-domain anti-forgery) is not a complete solution to
spam, and thus doing any action that would could stifle the diversity of
competition in anti-spam, is very dangerous to the greater good...".
Hope this helps.
-Shelby