Lately I this idea for email. It would work like a twitter handle for the user but similarly to domains and dns under the hood. Then you just use this handle to register and receive email communication. If you change email provider or get locked out for some reason you can just update the email the handle points to.
I do this since a long time. I don’t use my real email postbox address. I just use email addresses from my own domain server „catch all“ to the real email postbox.
If I ever change my email provider I just have to change the catch all rule.
I actually think they missed a chance here. They could have made the code in such a way that it anonymizes the receiver. Only japan post would know where this person lives.
I believe so too. The API they provide doesn’t need to respond with the exact address until an approved carrier makes an identified request. The availability of that API needs to be perfect though!