Forging stamps is up to 10 years in the UK, it's considered the same as counterfeiting money. But I think it has to be proven that it was intentional, so if th

Forging stamps is up to 10 years in the UK, it's considered the same as counterfeiting money. But I think it has to be proven that it was intentional, so if the sender was simply scammed by someone selling fake stamps that wouldn't be prosecutable.