Apple Successfully Implements OpenID Connect with Sign in with Apple
I&#x27;m glad they&#x27;ve got the tech right for the actual authentication, but their email relay is still far from usable.<p>It&#x27;s limited in very fundamental ways, that will prevent many companies of any scale from using it. It&#x27;s very difficult to make it work with an email service such as SendGrid, and it&#x27;s limited to 10 domains you can prove ownership of, and 10 specific email addresses.<p>I work for a company that charges users and ships physical products – our payment providers and shipping providers all need to be able to contact our customers if they choose to use those services, but this would be essentially impossible (or a prohibitive amount of technical work at scale).<p>It&#x27;s a very poor implementation. I wrote an obnoxiously long blog post about this. <a href="https:&#x2F;&#x2F;danpalmer.me&#x2F;2019-07-02-on-signing-in-with-apple&#x2F;" rel="nofollow">https:&#x2F;&#x2F;danpalmer.me&#x2F;2019-07-02-on-signing-in-with-apple&#x2F;</a>