If you want to keep Mail settings up to date across your devices, turn on iCloud Drive. IOS 15, iPadOS 15, or earlier: Turn on iCloud Mail (or Mail). IOS 16, iPadOS 16, or later: Tap Mail, then turn on Use on this.
If you want to send and receive iCloud Mail on your device, do one of the following: On your iPhone, iPad, or iPod touch, go to Settings > > iCloud. Reply to a shared reminder list invitation.Mark a reminder as completed or not completed.If you can’t create, import, edit, or delete contacts.Receive emails for updates to shared calendars.What you can do with iCloud and third-party apps.What you can do with iCloud and Reminders.Set up iCloud Keychain and iCloud Passwords.What you can do with iCloud Keychain and iCloud Passwords.What you can do with iCloud and Numbers.What you can do with iCloud and Messages.What you can do with iCloud and Keynote.Back up your iPhone, iPad, or iPod touch.What you can do with iCloud and Freeform.What you can do with iCloud and Contacts.What you can do with iCloud and Calendar.Check your iCloud storage on any device.What you can do with iCloud+ and Custom Email Domain.What you can do with iCloud+ and HomeKit Secure Video.What you can do with iCloud+ and Hide My Email.What you can do with iCloud+ and iCloud Private Relay.How iCloud keeps information up to date.Overview of apps and features that use iCloud.