Set up iCloud Mail on all your devices - Apple Support
https://support.apple.com/guide/icloud/set-up-icloud-mail-mmdd8d1d47/icloud
WebIf you want to send and receive iCloud Mail on your device, do one of the following: iOS 16, iPadOS 16, or later: Tap Mail, then turn on “Use on this [device].” iOS 15, iPadOS 15, or earlier: Turn on iCloud Mail (or Mail). If you want to keep Mail settings up to date across your devices, turn on iCloud Drive. The following settings stay up ...
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