And in support of this comment, Apple ID users DO have the option of sharing their email addresses if they want to. So, from the receiving end, if you see somerandomstring@appleid.apple.com as the email address, it should be pretty clear what your users want.
Now you CAN choose to say, "I don't want those users", if they do not fit into your grand plan of things.
Apple does forward emails, so you can even contact those users for your password recovery use case you mentioned in other comments. I think your problem is not the fact that you do not have an email ID, your problem is, your users have the option of pulling the carpet from under you.
Now you CAN choose to say, "I don't want those users", if they do not fit into your grand plan of things.
Apple does forward emails, so you can even contact those users for your password recovery use case you mentioned in other comments. I think your problem is not the fact that you do not have an email ID, your problem is, your users have the option of pulling the carpet from under you.