---
kind: "unit"
title: "39"
title_heading: "Postal Service"
key: "chI/subchE/part310"
level: "part"
label: "Part 310"
heading: "Enforcement of the Private Express Statutes"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/39/chI-subchE-part310"
sections_count: 7
---

# Part 310 — Enforcement of the Private Express Statutes

Title 39 C.F.R. — Postal Service › Chapter I — United States Postal Service › Subchapter E — Restrictions on Private Carriage of Letters

## Sections

- [§310.1. Definitions.](/cfr/39/310.1.md)
- [§310.2. Unlawful carriage of letters.](/cfr/39/310.2.md)
- [§310.3. Exceptions.](/cfr/39/310.3.md)
- [§310.4. Responsibility of carriers.](/cfr/39/310.4.md)
- [§310.5. Payment of postage on violation.](/cfr/39/310.5.md)
- [§310.6. Advisory opinions.](/cfr/39/310.6.md)
- [§310.7. Amendment of regulations.](/cfr/39/310.7.md)