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 currently generates relay addresses ending in privaterelay.appleid.com.

Hide My Email generates relay addresses on icloud.com.

New addresses created through either service will use private.icloud.com. Existing relay addresses will continue forwarding messages normally after the transition.

Sign in with Apple lets users create accounts without sharing a personal email address. Hide My Email extends the same concept across websites, newsletters, online shopping, and other online services.

Developers need to update email and account systems

Many websites and email systems use domain-specific rules to identify, validate, and process email addresses. Apple’s domain change could create problems for services that only recognize its existing relay domains.

Addresses ending in privaterelay.appleid.com and icloud.com were specifically highlighted in the developer notice. Developers were told to review account validation logic, allowlists, and other workflows that recognize those domains.

Filtering, suppression, and routing rules should also be reviewed before the transition begins. Apple said those systems may need updates to properly handle new addresses created after the rollout.

Users could encounter issues creating accounts, resetting passwords, receiving login verification codes, or accessing other account-related emails. Account access problems can occur even if email forwarding continues to function normally.

Apple hasn’t announced a launch date, but developers and email providers have been urged to prepare.