On Sat, 28 Feb 2004, Hector Santos wrote:
"Null SPF is for tracking purposes only"
why couldn't they just do this?
v=spf1 -all
Because of that line right above your question. They use the exists to
generate DNS queries (which always fail) that are then logged, to track
forgeries of their domain, and the effectiveness of SPF. It has been
discussed at length on the list in the past, see the archives for more.
--
Tim Wilde
twilde(_at_)dyndns(_dot_)org
Systems Administrator
Dynamic Network Services, Inc.
http://www.dyndns.org/