On Wednesday 10 January 2007 11:05, Julian Mehnle wrote:
Stuart D. Gathman wrote:
On Wed, 10 Jan 2007, Julian Mehnle wrote:
Interestingly, this is exactly the reverse of what Mail::SPF does,
query for SPF-type records
if there aren't any valid SPFv1 records, then query for TXT-type
proceed with record selection as per section 4.5
I don't recommend that because there are quite a few braindead
DNS servers which TIMEOUT for unknown record types. By checking
type 99 first, you get an long delay for the SPF check. While you
seem to have run into a TIMEOUT for type TXT, it is much more rare.
"quite a few" -- about how large a percentage of all the SPF-equipped
domains is that? I'd be really interested.
The question should be about all domains that show up in e-mail. You have to
query them all, not just the ones you know have SPF records.
Sender Policy Framework: http://www.openspf.org/
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