USPS would still need to check each stop for outgoing mail. No they don’t, that’s what the red flag on the mailbox is for. Everywhere I’ve lived, if you don’t

USPS would still need to check each stop for outgoing mail. No they don’t, that’s what the red flag on the mailbox is for. Everywhere I’ve lived, if you don’t put the flag up and there’s no incoming mail for you, they don’t stop.