https://wccftech.com/icloud-mail-is-down-and-apple-has-confirmed-it-will-be-back-soon/

It is not just you, Apple has confirmed that iCloud Mail service is down for some users around the globe.

After going to the Apple system status page, you’ll notice a quirky little yellow dot next to iCloud Mail. What this is means is, the service is currently facing issues for some users around the globe. Once that indicator turns green, you can start using iCloud Mail normally.