KS-MB4202PU-SV is a horizontal communal mailbox designed for apartment buildings and facilities. It features a front-in, front-out system where mail is deposited from the front and retrieved by opening the door upward. The mailbox incorporates a water-resistant structure that prevents rain infiltration and Nasta's proprietary Nasta Guard anti-theft mechanism, making it suitable for both indoor and outdoor use. As the growth of online shopping has created challenges with standard communal mailboxes that cannot accommodate letter packs, Nasta collaborated with Amazon to develop the D-ALL series based on Japan Post's recommended specifications for large mailboxes. Despite its slim external dimensions of 120 mm in height and 360 mm in width, the KS-MB4202PU-SV can accommodate large mail items up to 340 mm × 260 mm × 35 mm in size, significantly reducing the burden of redelivery attempts. The registered design Nasta Guard prevents mail theft, while the torque hinge mechanism allows the door to open and close quietly, preventing finger injuries. The interior features a sloped surface that guides mail items forward for easy retrieval, and the water-resistant structure made of resin and stainless steel materials allows for installation both indoors and outdoors. Combining aesthetic appeal with functionality, this communal mailbox brings the joy of delivering, the pleasure of receiving to both delivery personnel and residents alike.