I suppose I am a bit naughty, I open some of the mail.

Because my unit number is the same as the street number, I get mail not only from the previous tenants of my unit, but previous tenants of other units.

Some of it is junk, and sometimes the unit number is inside the letter. If it's junk I bin it, if something else I put no longer at this address in Unit X AND RETURN TO SENDER.

I have had the same dilemma at some jobs I've done, a lot of the mail would come out to a company that doesn't exist, but with the address approximately of where I was working, and most of it was advertising.