On 01/02/2020 09:53, Seth Blank via dmarc-discuss wrote:
Currently, AFAIK Microsoft's ARC implementation is internal only and is not yet expected to interoperate with external systems.
I'm happy to provide them with a New Year's reminder that people are watching. :-)
But yes, it's also worth noting that the item posted to the "Microsoft 365 Roadmap" at the end of October only discussed the use of ARC when receiving messages for mailboxes hosted by Microsoft. It didn't address any use of ARC in messages received from Microsoft by other entities.
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