CFR›Title 39›Chapter I›Part 310 ContainsSections 310.1–310.7CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 310—ENFORCEMENT OF THE PRIVATE EXPRESS STATUTES Sections 310.1 § 310.1 Definitions. 310.2 § 310.2 Unlawful carriage of letters. 310.3 § 310.3 Exceptions. 310.4 § 310.4 Responsibility of carriers. 310.5 § 310.5 Payment of postage on violation. 310.6 § 310.6 Advisory opinions. 310.7 § 310.7 Amendment of regulations. Authority39 U.S.C. 401, 404, 601-606; 18 U.S.C. 1693-1699.Source39 FR 33211, Sept. 16, 1974, unless otherwise noted. Previous 281 Part 281—Firm Mailings Damaged or Destroyed Through Transportation Accidents or Catastrophes Next 320 Part 320—Suspension of the Private Express Statutes