Apple Says iCloud Mail is Currently Down for Some Users [Resolved]
iCloud Mail is experiencing an issue and is currently down for some users, according to Apple's system status page. The outage was noted by author Dan Moren and is also impacting one of our MacRumors editors.

Affected users may be unable to access their iCloud inbox, send or receive emails, or complete other tasks through the Mail app across Apple devices and the web.
Update: Apple's system status page says the issue has been resolved.
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Top Rated Comments
https://www.apple.com/support/systemstatus/
I know it can suck when I have an issue that seems isolated to my configuration(s). At least this way, that user knows it's not "just" their system.