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@FrostCat said:Technically, failure to deliver them would be interfering with the mail, I would assume. You assume correctly. In UK, it's an offence to tamper with Royal Mail. I once read of a tale where a disgruntled client ordered his mail to be forwarded to someone's address (a company that had wronged him in some way) then signed up to several junk mail services. The company had no forwarding address for him but threatened to burn the sacks of unwanted mail until the client pointed out that it was an offence to tamper with it. They could write "not known at this address" and send it back, or had to store it until he could come to collect it.(yeah, the client was a cock - the story was told from the viewpoint of a company employee)