If this is really such a huge problem, the solution seems simple: simply let every mailbox scan the stamp before accepting the letter. For parcels this is being done already at the drop off point.
The mailbox could verify the stamp barcode and refuse it if it's invalid, or require a simple contactless payment when no stamp (or an invalid one) is present. Problem solved. It would also be handy because you don't need to keep stamps in stock for that once off time you need to post something.
Of course this tech hasn't existed for most of the life of the postal system but it does now. So why not do that?
Fining the recipient who had nothing to do with the alleged crime in question is a bit disingenious. It's something that was unavoidable in the past but not now.
The mailbox could verify the stamp barcode and refuse it if it's invalid, or require a simple contactless payment when no stamp (or an invalid one) is present. Problem solved. It would also be handy because you don't need to keep stamps in stock for that once off time you need to post something.
Of course this tech hasn't existed for most of the life of the postal system but it does now. So why not do that?
Fining the recipient who had nothing to do with the alleged crime in question is a bit disingenious. It's something that was unavoidable in the past but not now.