These steps work like a charm to stop SPAM calls and junk postal mail:
- Stop unwanted postal mail https://www.usa.gov/telemarketing#item-35222
- Stop credit and insurance offers https://www.optoutprescreen.com/selection
- Stop "direct mail" for $4 https://www.dmachoice.org/
- For everything else, collect your junk mail and occasionally go through each piece individually and enter it into https://www.catalogchoice.org/