Plowing around mailboxes and newspaper boxes is time consuming and potentially dangerous. Mailboxes that are too close to the road and do not provide enough clearance under the box are a candidate to be hit by a plow.
For the wing blades to pass under a mailbox, a minimum of 42 inches is required between the lowest point under the mailbox and the ground.
If you have a County approved swinging mailbox support, and the mailbox is damaged by the plow (not the snow); the County will be responsible for the damage. All other mailboxes, paper boxes, and their related supports are the responsibility of the property owner. The long term goal of the County is to have all mailbox supports conform to the County standard.