Freddie LeemanMicrosoft (Outlook.com and Outlook Enterprise) has ceased issuing DMARC reports. We observed an 85% reduction from the 22nd of February and a further 99% decrease from the 23rd. As of yesterday, we haven't processed any reports from them.
It seems Microsoft is dispatching DMARC reports, but there's an issue with their SMTP transmission.
Rather than using the standard format
MAIL FROM: <[email protected]>
they are including additional attributes:
MAIL FROM: <[email protected]> XATTRDIRECT=Originating XATTRORGID=xorgid:<GUID>
resulting in a syntax error, causing the emails not to get delivered and processed.
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