Yup, I really do this! About 7 years ago I remarked how irritating it was to receive such a great amount of junk mail and I wished there was a way to opt out of getting it. It was suggested by the my mail person that I put a note on the mailbox requesting no junk mail. So I took the suggestion and did it. Unless it specifically has my name on it I don't get junk ads and newspapers. Is this a perfect solution? Nope. When there is a fill in mail person it's a 50/50 chance of getting the ads and junk mail. It's not a big deal I just drop it in the recycling box. My mail carrier says they just take it back to the USPS and drop it into recycling.

And just an FYI.. The secretary at work doesn't get rid of useless junk mail for me. I riffle through my own mail and drop it in the recycling bin - thank goodness I get very little. There really should be a way to opt out of junk mail like there is for spam calls!

Edit: Just for clarity, they don't personally carry the mail to the mail box. They drive up in a jeep, open their window and put the mail in the mail box. There is a box in the vehicle that they collect junk, etc and when they get back to the USPS and it goes into recycling. If it has my name on it then it has to be delivered to me.