Is your mailbox properly installed and secured for the winter? US Postal Service guidelines indicate that mailboxes shall be placed between 41'' to 45" off the ground and back between 6" to 8" from the curb. Please make sure your mailbox is properly installed and secured so that potential problems during snow removal can be avoided. Each homeowner is responsible for the general maintenance of their mailbox/post. A mailbox when appropriately installed and in good condition will be able to withstand the snow being discharged from the plow during a snow event.