iCloud: Set up an @icloud.com email address
If you set up iCloud using an Apple ID that doesn’t end with @icloud.com, @me.com, or @mac.com, you must set up an @icloud.com email address before you can use iCloud Mail.
If you have an email address that ends with @mac.com or @me.com, you already have an equivalent address that’s the same except it ends with @icloud.com. If you use email aliases that end with @mac.com or @me.com, you also have equivalent addresses that end with @icloud.com.
On an iOS device, go to Settings > iCloud, turn on Mail, then follow the onscreen instructions.
On a Mac, choose Apple menu > System Preferences, click iCloud, select Mail, then follow the onscreen instructions.
After you set up your @icloud.com email address, you can use it to sign in to iCloud. You can also sign in using the Apple ID you used to create your iCloud account.
You can send iCloud email from any of the following addresses:
Your iCloud email address (firstname.lastname@example.org)