How long must Intelligent Mail barcodes remain unique?

The requirement for Intelligent Mail barcodes to remain unique for 45 days is crucial for ensuring efficient tracking and processing of mail items. This timeframe allows postal systems and mailers to maintain a clear and organized handling process. When an Intelligent Mail barcode is used, it must not be reused for at least 45 days to prevent confusion and ensure the integrity of the tracking data. During this period, the barcode helps identify specific mail pieces, enabling the postal service to manage delivery accurately and effectively. By adhering to this unique barcode requirement, businesses can enhance their mail management practices and optimize delivery performance.