Apple is unifying email domains for Sign in with Apple and iCloud+ Hide My Email this summer. Both services will transition to a single shared domain: private.icloud.com. New addresses created for Sign in with Apple will be on private.icloud.com, previously on privaterelay.appleid.com. Similarly, new iCloud+ Hide My Email addresses will also use private.icloud.com, moving from icloud.com. Existing email addresses on the older domains will continue to function without interruption. Developers with apps or websites using Sign in with Apple need to update their systems. They must ensure their account systems, email validation, and allowlists accept the new private.icloud.com domain. They should also continue to support the existing privaterelay.appleid.com and icloud.com domains. Email service providers are advised to update their filtering and routing rules. These updates should include the new private.icloud.com domain in any domain-specific configurations.