18 U.S.C. § 1712

Whoever, being a Postal Service officer or employee, makes a false return, statement, or account to any officer of the United States, or makes a false entry in any record, book, or account, required by law or the rules or regulations of the Postal Service to be kept in respect of the business or operations of any post office or other branch of the Postal Service, for the purpose of fraudulently increasing his compensation or the compensation of the postmaster or any employee in a post office; or Whoever, being a Postal Service officer or employee in any post office or station thereof, for the purpose of increasing the emoluments or compensation of his office, induces, or attempts to induce, any person to deposit mail matter in, or forward in any manner for mailing at, the office where such officer or employee is employed, knowing such matter to be properly mailable at another post office— Shall be fined under this title or imprisoned not more than two years, or both.