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5-3 Marking Methods and Surfaces

5-3.1 Marking Methods

Any required address, marking, or endorsement placed on the outside of a mailing container should be made with a waterproof material that cannot be rubbed off or smeared. The lettering must be sharp and readable at a distance of 30 inches.

5-3.2 Surfaces

Marking methods and container surfaces must allow application and retention of adhesive stamps, postage meter impressions, and postal endorsements made by hand stamp, ballpoint pen, or number 2 pencil. Address labels and, particularly, outside envelopes must be firmly sealed and attached to containers, with no more than 1/8-inch separation between the ends of the envelope and the container.

A container that does not meet these marking requirements and has caused previous mail processing problems is not acceptable for mailing.

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