Highly glazed card stock or card stock with a design that affects readability or processing is not acceptable. 241.223 QualityĬards must be constructed to be strong enough to withstand normal handling. Brilliant colored cards are not authorized. Light-colored cards that do not interfere with the reading of the address and postmark must be used. Note: Unenclosed cards exceeding the size limits for postcards are mailable at the First-Class Mail International letter price if they do not exceed 4-3/4 inches high or 9-1/4 inches long.
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