Sign in with Apple domain consolidation could trip up unprepared services

Apple is changing the email domains behind Sign in with Apple and Hide My Email, forcing developers and email providers to update systems before the transition begins.


A June 15 developer notice told developers to update account systems, email validation tools, and allowlists before the rollout begins. Email service providers were also asked to review filtering, suppression, and routing rules tied to Apple's current relay domains.

The change affects two privacy features that let users interact with apps, websites, and online services without revealing a personal email address. Sign in with Apple relay addresses on icloud.com.