Title 39 › PART I — GENERAL › CHAPTER 6 — PRIVATE CARRIAGE OF LETTERS › § 601
Letters can be carried outside the mail if six rules are met: the letter is inside a properly addressed envelope that is sealed so the letter can’t be removed without damaging it; postage equal to what mail would cost is on the envelope using stamps or postage‑meter stamps; the sender cancels the stamps in ink; and the envelope is ink‑marked with the date of the letter or when it was sent or received. A letter can also be carried out if private carriage costs at least six times the current single‑piece first‑class first‑ounce rate, if it weighs at least 12½ ounces, or if Postal Service rules (including 39 CFR 310.1 and 320.2–320.8 as of July 1, 2005) allow it. The Postal Regulatory Commission will create any needed rules.
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Legislative History
Reference
Citation
39 U.S.C. § 601
Title 39, Postal Service
Last Updated
Aug 21, 2026
Release point: 119-102