On 11/16/2016 8:03 AM, Murray S. Kucherawy wrote:
That's not correct. The verifying MTA, if it doesn't know the new tags, is unaffected by the new tags because RFC6376 directs the verifier to ignore them. It's as if they weren't there.
Do you have any data with unknown tag recordings adding any (erroneous) negative scoring or suspicion on mail?
For example, there is a DMARC wizard out there, give it a domain and it evaluates/displays the DMARC record. It will report unknown tags and I already seen one case where this adds unsureness to the situation.
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