My Mum had some post from the previous owners of her house from when she moved in (2007) until she died (this year) One thing I learned was that if you put "No longer at this address, please amend your records" on the envelope, it doesn`t work. The mail arrives back at it`s original place, someone opens it and throws the envelope in the bin and the message doesn`t get through. When I had a rental property and I received mail for previous tennants, I used to open it and phone the companies concerned. I`m sure there will be people on here who say I shouldn`t have done that but the companies were quite happy about it and it did the trick.