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Re:Facebook-owned sites were down by still_grokking on Monday October 04, 2021 @05:38PM (#28752383)
I've read here on HN that exactly this was the issue as they had one of the bigger outages (I think it was due to some auth service failure) and GMail didn't accept incoming mail.
Re:Facebook-owned sites were down by l9i on Monday October 04, 2021 @06:05PM (#28752679)
A Gmail outage would be barely an inconvenience as Gmail plays a minor role in Google's disaster response.

Disclaimer: Ex-Googler who used to work on disaster reponse. Opinions are my own.