Comment by jonpurdy
In Canada, you can place a red dot (or write no unsolicited mail) on your mailbox and they will withhold delivering anything not directly addressed to you.
I was shocked when I moved to SF and found out there was no way to opt out of unaddressed mail (or "current resident").
In Finland AFAICT there's no bulk postal rate. Instead, paper spam is delivered thru mail slots by private services that hit all the buildings in the neighborhood and drop collections of paper spam. So, many people post a note on their door opting out from this stuff. (Ei mainoksia = No ads.) It must be saving absolutely huge amounts of paper.