39 U.S. Code § 403 - General duties
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(a) The Postal Service shall plan, develop, promote, and provide adequate and efficient postal services at fair and reasonable rates and fees. The Postal Service shall receive, transmit, and deliver throughout the United States, its territories and possessions, and, pursuant to arrangements entered into under sections 406 and 411 of this title, throughout the world, written and printed matter, parcels, and like materials and provide such other services incidental thereto as it finds appropriate to its functions and in the public interest. The Postal Service shall serve as nearly as practicable the entire population of the United States.
(b) It shall be the responsibility of the Postal Service—
(2) to provide types of mail service to meet the needs of different categories of mail and mail users; and
(c) In providing services and in establishing classifications, rates, and fees under this title, the Postal Service shall not, except as specifically authorized in this title, make any undue or unreasonable discrimination among users of the mails, nor shall it grant any undue or unreasonable preferences to any such user.
Source(Pub. L. 91–375, Aug. 12, 1970, 84 Stat. 723; Pub. L. 96–70, title I, § 1331(e)(1),Sept. 27, 1979, 93 Stat. 482.)
1979—Subsec. (a). Pub. L. 96–70substituted “The Postal Service” for “Except as provided in the Canal Zone Code, the Postal Service”.
Effective Date of 1979 Amendment
Amendment by Pub. L. 96–70effective Oct. 1, 1979, see section 3304 ofPub. L. 96–70, set out as an Effective Date note under section 3601 of Title 22, Foreign Relations and Intercourse.
Section effective Jan. 20, 1971, pursuant to Resolution No. 71–10 of the Board of Governors. See section 15(a) ofPub. L. 91–375, set out as a note preceding section 101 of this title.
Continuation of Mail Delivery Services
Provisions requiring continuation of six-day delivery and rural delivery of mail at not less than the 1983 level were contained in the Transportation, Treasury, Housing and Urban Development, the Judiciary, and Independent Agencies Appropriations Act, 2006, Pub. L. 109–115, div. A, title VI, Nov. 30, 2005, 119 Stat. 2490, and were repeated in provisions of subsequent appropriations acts which are not set out in the Code. Similar provisions were also contained in the following prior appropriations acts:
Pub. L. 104–208, div. A, title I, § 101(f) [title II], Sept. 30, 1996, 110 Stat. 3009–314, 3009–326.
Pub. L. 99–500, §§ 101(m) [title II], 102, Oct. 18, 1986, 100 Stat. 1783–308, 1783–314, 1783–346, and Pub. L. 99–591, §§ 101(m) [title II], 102, Oct. 30, 1986, 100 Stat. 3341–308, 3341–314, 3341–346.
Pub. L. 97–35, title XVII, § 1722,Aug. 13, 1981, 95 Stat. 759, as amended by Pub. L. 98–369, div. B, title II, § 2209,July 18, 1984, 98 Stat. 1061.
Prohibition of 9-Digit ZIP Code
Pub. L. 97–35, title XVII, § 1726,Aug. 13, 1981, 95 Stat. 761, prohibited Postal Service from implementing ZIP code system using more than 5 digits before Oct. 1, 1983, and prohibited executive agencies from taking action to conform mailing procedures to ZIP code system using more than 5 digits during the period from Aug. 13, 1981 to Dec. 31, 1982.