Is this only for regular mail, or also for packages?
The service is for regular mail, not for receiving or processing parcels. TDPB is a digital mail service focused on letters and documents.
If a package is delivered to your address by mistake or unexpectedly, it’s up to you whether you accept it or not. Should you choose to accept it, you can either forward it to the customer or let them pick it up in person if they’re nearby.