On Mon, Jul 13, 2015 at 5:22 PM, John Levine <jo...@taugh.com> wrote:
> >I hadn't considered the DNS lookup issue for SPF mentioned previously. I > thought the ten lookup limit applied once you located > >the correct DNS record. Google should have been more considerate and > required a record, such as, _google-pm.domain.tld. > > Google's record doesn't affect SPF. Look at section 4.5 of RFC 7208, > and you'll see that SPF takes all of the records returned for the TXT > lookup, and only picks the one that starts with v=spf1. Other records > are ignored and don't count toward the lookup limit. > Except it may not fit in an 1500 bytes UDP packet anymore... fragmentation and or TCP will occur... delaying the answer, enough for the mailserver to move on, not waiting for the answer anymore.
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