On Mon, 10 Dec 2007, Greg Hewgill wrote:
Thanks for the feedback so far on spf-all.com.
I should have mentioned that there are a few cases not yet handled that
I will be considering:
- use of redirect= to make one domain the same as another
- ending a record with include: to include another record that ends in
-all
There may be other unusual cases that I should consider. This mailing
list is probably a good source of test cases!
Of course, "-all" is only a heuristic test. An accurate but less-trivial
way to rate SPF records is by number of IPs in the pass/neutral/softfail/fail
sets. A "v=spf1 +all" would have 2^32,0,0,0. A "v=spf1 -all" 0,0,0,2^32.
But "v=spf1 ip4:1.2.3.4/0 -all" would have 2^32,0,0,0 also - despite the
"-all". Giant email providers might have thousands of authorized IPs -
despite having strict SPF records - but they have more problems policing
their millions of users, so that's fair.
--
Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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