Please visit the United States Postal Service web site for details on weight and dimensions used to determine first class postage rates.
It is recommended that you assemble a single card, including envelopes and any enclosures, and take it to your local postal service branch for weighing to determine the exact postage needed prior to mailing your cards.
Note that all square envelopes weighing 1 oz. or less are subject to a "nonmachinable" surcharge.
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