Apple is changing the domain for Sign in with Apple and Hide My Email aliases to @private.icloud.com, making it easier for services to ban these emails without affecting non-relay mailboxes on iCloud mail. This change may reduce the effectiveness of Hide My Email, a feature intended to provide privacy by generating unique, disposable email addresses. The change has not yet taken effect, and users can still generate aliases on the @icloud.com domain. This change may impact users who rely on Hide My Email for privacy.