iCloud Mail has been experiencing an outage that began a few hours ago, and some users may be experiencing intermittent issues with accessing their inbox as a result, according to Apple's system status page.
Only some users are affected by the outage, according to Apple, so your mileage may vary. We'll update this story once the issue is marked as resolved.
There was also an iCloud Keychain outage over the weekend that is now resolved.
Update: Apple says the iCloud Mail outage is resolved.
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https://www.cnn.com/2020/12/15/tech/gmail-outage-google/index.html