2006—Puspan. L. 109–435 amended section generally. Prior to amendment, section consisted of subsecs. (a) to (d), related to special authority relating to reduced-rate categories of mail.

Section applicable with respect to rates for mail sent after Sept. 30, 1993, see section 704(c)(1) of Puspan. L. 103–123, set out as an Effective Date of 1993 Amendment note under section 3626 of this title.