An officer or employee of the Postal Service may not receive any fee or perquisite from a patron of the Postal Service on account of the duties performed by virtue of his appointment, except as authorized by law. ( Pub. L. 91–375 , Aug. 12, 1970 , 84 Stat. 733 .) Statutory Notes and Related Subsidiaries Effective Date Section effective July 1, 1971 , pursuant to Resolution No. 71–9 of the Board of Governors. See section 15(a) of Pub. L. 91–375 , set out as a note preceding section 101 of this title .