The local Postal Services General Regulations stipulate that:
• All premises shall be provided by the respective owner or occupier with an adequate letter-box so as to enable the delivery of postal articles;
• Apartment blocks shall also be provided with accessible letterboxes, made to lock, one for each apartment. Each letterbox shall bear the number of the apartment to which it refers;
• All premises which have their main entrance more than four and a half meters distant from the gate or other access to the street, shall be provided with letterboxes made to lock and immediately accessible from the street.
• All other premises shall be provided with a letterbox immediately accessible from the street.
In accordance with the Postal Services Act (Article 40), a postal operator may refuse to deliver any postal article where (i) the premises to which it is addressed may be of threat to the health and personal safety of the delivering officer and (ii) the premises to which it is addressed is not provided with a letterbox as required.
More information is available in the attachment below.