43 C.F.R. § 20.509 Penalty mail and official stationery.
Title 43 - Public Lands: Interior
(a) An employee is prohibited from using any official envelope, label, or indorsement authorized by law, to avoid the payment of postage or registry fee on his or her private letter, packet, package, or other matter in the mail (18 U.S.C. 1719). (b) Official Government envelopes and official letterhead stationery are Government property that may only be used for authorized purposes. Employees' use of Government envelopes to mail their own personal job applications is not authorized.
Title 43: Public Lands: Interior
PART 20—EMPLOYEE RESPONSIBILITIES AND CONDUCT
Subpart E—Other Employee Conduct Provisions
§ 20.509 Penalty mail and official stationery.
