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Re: RE: rr.com and SPF records

2005-03-16 12:50:54
On Wed, 16 Mar 2005, Radu Hociung wrote:

If you need to publish the full list of mail sources, I would not do it 
as an SPF-resolvable record, but some other way. Perhaps provide a exp= 
(explanation message) that points to your own why.html web-page, and put 
the list of IPs there.

Why not use an SPF optimizer to convert the high level rr.com record
to a list of raw IPs, and publish that?  It could be refreshed daily.
An optimizer will follow includes and evaluate all mechanisms to 
form a list of lower level mechanisms (usually ip4).

As mentioned before, another efficient way to list individual ips is with
a host name with multiple a records:

mailsource      IN A 1.2.3.4
mailsource      IN A 2.3.4.5
mailsource      IN A 3.4.5.6
mailsource      IN A 4.5.6.7
mailsource      IN A 5.6.7.8

But ip4 works better for subnets.

-- 
              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.