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Re:We mailed one hundred letters to test the postal service by jermaustin1 on Monday May 03, 2021 @10:54AM (#27025815)
If it is a myth, it is propagated by the USPS.

They will deliver for every mail address. USPS designated non-deliverable addresses are typically new addresses that haven't been added, or as another commenter posted, an address that is unsafe to deliver.

Now, delivering to your mailbox might be a central mail hub that is part of your community/neighborhood, and not directly to your door, but that is still your address's mailbox.

Re:We mailed one hundred letters to test the postal service by Rebelgecko on Monday May 03, 2021 @06:31PM (#27031700)
What's the difference between a mail address and a street address?