Rescue email

See: About your Apple ID email addresses - Apple Support

About your Apple ID email addresses

Learn how to add, change, or delete the different types of email addresses that you can use with your Apple ID account.

Email addresses you use with your Apple ID

Your Apple ID uses email addresses to sign you in to your account with Apple. With your Apple ID, you can access services like the App Store, Apple Music, iCloud, iMessage, FaceTime, and more. We use your email addresses to send you information about your account, and to help friends and family communicate and share with you.

Apple ID email address

This is the email address you use with your password when signing in to any Apple service. It’s also the primary email address on your account.

Additional email addresses

Add extra email addresses to your account to help people find you on Apple services like FaceTime, iMessage, and Find My Friends.

Rescue email address

You have the option to add a rescue email address to your account for more security. You can see it when you sign in to your Apple ID account page.

Before you can use a new or updated Apple ID, we'll send you a verification email to make sure that the email address belongs to you.

About your Apple ID email addresses - Apple Support

https://support.apple.com/en-us/HT201356