Mail Are there any restrictions in terms of items that cannot be delivered by mail? Are there any restrictions in terms of the design of mail items? Can Registered Mail be delivered to any destination in the world? Do I need to fill out a customs form for my shipment? How can I make sure that my international mail is delivered to the addressee only? How do I make sure that my international mail is addressed correctly? How does PostNL’s delivery quality compare with other postal service providers? I have a question about my Registered Mail delivery. Who should I contact? I’m a business customer and would like to use one of your products or services. Can you help me? Is online tracking available for all Registered Mail deliveries? What happens if items cannot be delivered? What is the best delivery solution for items worth more than € 50? When will my mail be delivered?