On Sun 08/Dec/2024 01:30:27 +0100 Daniel K. wrote:

[...] I see we receive similar third party reports from, among others:

        fastmaildmarc.com       for fastmail.com
        dmarc.mailmike.net      for inboxsys.net


Inboxsys is wise not to set a rua= tag in the DMARC record of the domain it uses to send reports. For fastmail and others who don't have the same consideration, it may happen that small operators exchange messages with one of these domains only sporadically. In that case, an aggregate report can be the only message received by them during the entire next day. However, it still deserves to be reported, with <count>1</count>. Then, in turn, that domain will report that they received that report, and so on, and so forth...


Best
Ale
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