(a) Except as otherwise provided in this section or section 3220(a) of this title, an officer, executive department, or independent establishment of the Government of the United States may not mail, as penalty mail, any article or document unless—
(b) Subsection (a) of this section does not prohibit the mailing, as penalty mail, by an officer, executive department, or independent agency of—
(4)
forms, blanks, and copies of statutes, rules, regulations, instructions, administrative orders, and interpretations necessary in the administration of the department or establishment;
(7)
announcements of the publication of maps, atlases, and statistical and other reports offered for sale by the Federal Power Commission as authorized by section 825k of title 16; or
(Pub. L. 91–375, Aug. 12, 1970, 84 Stat. 752; Pub. L. 99–87, § 1(c)(1), Aug. 9, 1985, 99 Stat. 291.)