It used to be common in Sweden to see stickers by the mail slot that read "No advertisement, please! But gladly the IKEA catalogue." They stopped distributing the printed catalogue long before 2021, but I've kept the sticker.
Ha, does the postman/postwoman[0] respect the sign? I've got a "nevhazujte letáky" sticker on my mailbox ("no flyers/ads") that is completely ignored. As an immigrant this is particularly grating around election season when my mailbox is stuffed with material from a couple of anti-immigration candidates.
[0] - I just realised that I only use the Scottish gender-neutral slang "postie" and don't know the correct one in standard English :D
Ye, at the time the Cinema flyer guy actually did read the signs and we got the flyer, but almost no other flyers.
The mailman proper, if I can call them that, did however deliver all stamped mail no matter what. The "no adds"-sign does not work for stamped adds, or like flyers put into the newspaper, etc.
Oh yeah I wouldn't expect the mail carrier to make a judgement call on when I want mail if my name and address was on an envelope. But for the flyers from supermarkets and things that get stuffed into every mailbox should really respect the "no flyers" sticker. Ah well, it's only a minor inconvenience in the end
I have a friend who is a mail-carrier (which I think is the most accurate gender-neutral term) for Canada Post. She refers to herself often as "postie" as well, and her co-workers as "posties". :]