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William Leibzon wrote:
Julian Mehnle wrote:
The more important problem (as I discussed in my last mail in this
thread from 5 minutes ago) I think is what to do if both types are
queried but the DNS queries' statuses differ.
Local preference of the system doing the check - they must choose either
of the record. If there were errors in checking one of the records, I'd
choose the one that did not cause an error. If one of the records
resulted in fail (as in ip address not in the list of sources that send
email for given domain) and other is pass on the safe side its probably
better to choose pass. Its possible that complex-enough anti-spam system
that does not make immediate reject/accept decisions (unlike mail server
doing test right after MAIL FROM) could use result from both TXT and
TYPE99 when they differ in it spam score computation structure. All of
those are of course corner-cases.
You are missing the point that this discussion is particularly about one
query returning RCODE 0 but no "v=spf1" records and the other query
returning RCODE != 0/3 or timing out. In that case there is no usable SPF
record.
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