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Publication 542 - Understanding the Private Express Statutes - Contents
5-2
Private Carriage in Limited Instances
(39 CFR 310.2(b)(1))
Private carriage of a letter is lawful if the following requirements are met:
The letter is enclosed in an envelope or other suitable container.
The amount of postage that would have been charged on the letter if it
had been sent through the Postal Service is paid with U.S. postage or postage meter stamps on the cover or by other methods approved by the Postal Service.
The name and address of the person for whom the letter is intended
appear on the cover.
The cover is so sealed that the letter cannot be taken from it without
defacing the cover.
All stamps on the cover are canceled in ink by the sender.
The date of the letter, or of its transmission or receipt by the carrier, is
endorsed on the cover in ink by the sender or carrier, as appropriate.