Being Canadian, the recent strike by Canada Post employees has created quite the backlog of mail. I just saw a postal worker filling up our community mailboxes. Pretty sure 90% of it will be spam! I wondered, does CP have a spam filter? Turns out they do! But it's a bit old-school... cause you have to just leave a note.
How to stop receiving advertising mail | Canada Post
Our Consumers’ Choice program offers a simple way for Canadians to stop receiving unaddressed advertising mail.