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FIRST-CLASS MAIL LETTER 2017 POSTAGE RATES 2016 POSTAGE RATES INCREASE/DECREASE. First-Class Mail Letter (1 oz.) - Retail/Post Office Rate $0.49 $0.47 $0.02. Metered Mail (1 oz.) - Online Postage Providers and Postage Meters $0.46 $0.465 -$0.005. First-Class Mail Letter - each additional ounce $0.21 $0.21 NO CHANGE.
The postage just has to add up to the postage of a letter. Right now an average letter of normal dimensions and weight, costs 45 cents. â¦Postcard rate is 32 cents, so you would need two stamps. Postage stamps are just like money, as long as it adds up to the current rate, even stamps that are 20 years old are valid.