Why do some stamps have barcodes and numbers like this? : r/USPS

Counterfeit Postage??? : r/usps_complaints

What are barcoded stamps and how do they work? - BBC Newsround

What's in that USPS postage barcode? « Frederick's Timelog

AMS :: Feature Column from the AMS

Eventually it will just be a barcode, won't it?' Why Britain's new stamps are causing outrage and upset, Society

Intelligent Mail Barcodes (IMb) – What Are They and Why Are They Important? - Kessler Creative

DMM 708 Technical Specifications

Package returned return to sender written tracking bar code blocked out with sticker and address ripped off. Was this by buyer or USPS themselves? Weird : r/USPS

What do those barcodes on my mail mean? - Extend Your Reach

International Mail

Philately