Can someone provide a pointer to more information about what is outlined
here? I am not aware of a "reputation service" that works like this.
Am I misreading this, or simply ignorant?
Many thanks,
-dgl-
At 06:56 PM 1/27/2007 -0500, John A. Martin wrote:
"David" == David MacQuigg
"Re: SPF basics commentary"
(Sat, 27 Jan 2007 14:00:56 -0700)
David> For most SPF records, the HELO and Return Address
David> authorizations should be one and the same.
Does that mean that the domain part of the address given in the MAIL
FROM should be the same as the FQDN used in the HELO command?
No, just that the mailfrom domain match the last few parts of the hostname in
the HELO command. This still leaves a little confusion as to how many parts
to include when we look at a HELO name like mx1.example.co.uk. (We haven't
seen the MAIL FROM command yet.) What we do is start by looking up the record
for co.uk:
$ dig txt co.uk.s-id.net +short
"opt=IDlevel:3"
This tells us that records in this domain are kept at level 3. A second query
then produces the desired result:
$ dig txt example.co.uk.s-id.net +short
"svc=S1:A,M2:A,H1:B ip4=192.168.0.0/24"
This domain has ratings from three reputation services, and is authorized to
transmit from one block of IP addresses.
-- Dave
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