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The _Letter Post Regulations_ article RL 128 defines specific dimensional requirements for address placement on envelopes, crucial for efficient postal processing. The addressee's address area must be positioned at least **15 mm** from the right and bottom edges, and at least **40 mm** (with a 2 mm tolerance) from the top edge, extending no more than 140 mm from the right-hand edge. These precise measurements ensure rapid optical reading and facilitate manual sorting and delivery by postal services. Adherence to these Universal Postal Union (UPU) standards prevents interference with indexing, coding, and address detection areas, which must remain blank. While individual countries may adapt these values, they must maintain a minimum address area width of 74 mm. Proper placement avoids extraneous markings to the right, below, or within a 15 mm wide area to the left of the address, extending from the first line to the bottom edge, and a 15 mm high by 140 mm long area from the bottom-right corner.

Explains the proper formatting of international addresses on postal items, a critical aspect for ensuring successful delivery of QSL cards. It details how the country of origin dictates the destination country's name format, while the destination country's postal authority governs the remainder of the address. The resource highlights _Universal Postal Union_ (UPU) regulations, specifically Article RL 123.3.3, which mandates the use of roman letters and Arabic numerals for clarity. It provides practical examples, such as an item from Great Britain to the United Arab Emirates, illustrating the need for dual-language addressing. The guide also clarifies the separation of elements for proper transmission versus local delivery, ensuring that the destination country name is clearly marked in capital letters and preferably in an internationally recognized language to facilitate transit, preventing misdirection and ensuring a **99%** delivery rate for QSLs.