Kosh Naranek: Archived.
From the United States Postal Inspection Service Code:
"Mailboxes are considered federal property, and federal law (Title 18, United States Code, Section 1705), makes it a crime to vandalize them (or to injure, deface or destroy any mail deposited in them). Violators can be fined up to $250,000, or imprisoned for up to three years, for each act of vandalism." http://www.usps.com/postalinspectors/smashbox.htm