Thousands of counterfeit Forever postage stamps are seized in Chicago - Royal Mail's app lets customers detect counterfeit stamps - Royal Mail pauses fines for 'fake' stamps after apparent flaw in fraud scanners - UK flooded with forged stamps despite using barcodes -- to prevent just that - Royal Mail 'investigating' claims of problems with barcoded stamps 'after customers fined' - Royal Mail investigates counterfeit stamps as customers complain over PS5 fines