I don't think I have ever seen a message with the Auto-Submitted header. I will try to run checks whether providers actually do support this, or that's dead letter, like half of the RFCs out there... As for outlook.com and office 365, I've seen that they actually do implement outlook-specific features (e.g. X-MS-Exchange-Organization-PCL on messages failing DMARC), so I am hopeful that this may get implemented.
additionally, they may have implemented it and I am not in fact seeing real autoreply, but rather spam disguised as autoreply or autoreply from an MUA which draws mail via POP/IMAP. it's not easy to tell the two without conducting quite a bit of testing.
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