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Re: PTR lookups in SPF (was: SPF is not usableaslegal measure against spammers.)

2004-07-19 09:11:24
On Mon, 19 Jul 2004, Andriy G. Tereshchenko wrote:

IMHO, PTR is nothing more that exists:RSPF.jrandomdomain.com

Actually, *all* the SPF mechanisms are simply shortcuts for exists.
SPF would work just fine if exists was the only mechanism.
Someone complained that exists queries are not cached.  That is
not true, they are cached for the duration you specify, just like any
other DNS result.

That being said, the shortcuts are useful for admins who

a) don't have an easily customizable DNS server handy

or

b) can understand A,MX,PTR but have trouble understanding exists.

I am hoping to find time to implement a Python DNS server to address (a).

-- 
              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
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