The CAYA-Postbox is on the one hand the address for your letters to be digitized, on the other hand your platform to manage documents digitally.
You can pass on your CAYA-Postbox as the recipient address to correspondences. This way, you decide whose mail you want to receive digitally.
You can access your personal postbox address at any time via the settings in your CAYA app or on the web platform. You can find more details about this in this article: What is my postbox address?
Important: This is a postal address only and not a summonable address! You can find more on this topic in this article: Is the Postbox address a summonable address?