On Aug 25, 2005, at 2:08 PM, Bill Sommerfeld wrote:
In this case, the two experiments interpret the same codepoints in the DNS in subtly different ways. A mail-sending domain indicates that it is participating by publishing certain DNS RR's. Crucially, a mail-sending domain cannot opt in to the SPF experiment without also opting in to the senderid experiment. This renders any claimed results of either experiment suspect.
If this is the source of the conflict, then BOTH experiments should not use the v=spf1 records.
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