On Tue, 12 Oct 2004, Dan Barker wrote:
the SPF for businessweek.com says:
v=spf1 mx include:mcgraw-hill.com -all
...
including the mcgraw-hill records:
v=spf1 ip4:66.54.164.0/24 ip4:64.94.160.128/26 mx ptr -all
...
Where do you see a rule to allow traffic from 198.45.18.176
(corp148mr3-11.mcgraw-hill.com)? Did the "-11" in the name fool you?
ptr
ps: I'm not sure what the ptr means. I'll look that up.
When appearing in SPF for the McGraw-hill.com domain, ptr means check
whether the validated PTR record for the IP address ends in
mcgraw-hill.com - which it does. That is why the IP passes.
--
Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.