Hi Ivan,

There is in general no way to identify multiple DMARC reports for the same message[1]. The spec is simply pointing out that DMARC report consumers cannot assume things like aggregate message counts across reports from multiple receivers indicate that same number of original messages. For example, it would be incorrect to tell a domain registrant that of the 22,513 messages sent (information obtained by some means other than DMARC), the 18,514 reported in DMARC reports indicates that 82.2% of messages bearing that From: domain are reaching receivers who provide DMARC feedback.


- Roland

1: As an existence proof: you could send each message with its own unique RFC 5322 From: domain as "From: User <user@{message-id}.sender.example>", in which case you'd be able to pair up related reports. This almost certainly isn't a good idea.

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On 23/02/18 18:53, Ivan Kovachev via dmarc-discuss wrote:
Hello all,

in section 9.3 of the ARC RFC it says:

"Mediators SHOULD generate DMARC reports on messages which transit their system just like any other message which they receive. This will result in multiple reports for each mediated message as they transit the series of handlers. DMARC report consumers should be aware of this behaviour and make the necessary accommodations."


Could someone please advise how to identify multiple DMARC reports for the same message and display a single final result instead of multiple results for the same message (from the perspective of DMARC report consumers)?


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