Apple’s decision to move Hide My Email to a dedicated domain “private.icloud.com” appears to have the effect of making it easier for platforms that wish to block iCloud aliases.
Apple is unifying the email domains used by Sign in with Apple and iCloud+ Hide My Email under a single domain private.icloud.com later this summer. Sign in with Apple currently uses privaterelay.appleid.com, while Hide My Email uses icloud.com, the same domain as standard iCloud email addresses.
This shared domain has historically made it difficult for services to selectively block disposable iCloud addresses. Blocking icloud.com outright would also block legitimate users with standard Apple email accounts. With the new subdomain, this compromise disappears.
@vxdb on Other netizens noted that email services, signup feeds, and anti-abuse systems will now have a clear, unambiguous target if they choose to restrict alias-generated addresses.
Apple said existing addresses on existing domains will continue to work and mail will be forwarded without interruption, so current Hide My Email users will not lose access to their aliases. However, the new addresses generated after the migration will include the private.icloud.com domain, and it is these addresses that can be blocked in isolation for the first time.
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