Back in the olden days (before junk email!) I contacted the Australian Direct Marketing Assn to get my name removed from lists maintained by their members. I assume they still exist & can still stop unwanted mail being sent by their members.

We also have a Do Not Call Register, which works well, tho charities, politicans, marketing companies & companies you've dealt with are exempted.

seems like the situation is the same all around the world

sandra