Can the post office just stop delivering mail because mailbox is blocked?

Yes, the post office can suspend mail delivery if a mailbox is blocked or inaccessible. The USPS requires that mailboxes be clear and accessible to ensure the safety of its carriers and the timely delivery of mail. If a mailbox is consistently blocked, the postal service may leave a notice informing the resident of the issue and the need for clearance. Continued obstruction could result in the suspension of deliveries until the problem is resolved.