Summary of the April 10, 2016 Postage Rates: Domestic Mailing: First Class Mail Letters (1 oz.) rates decreased from $0.49 to $0.47 when purchased at the Post Office. Each additional ounce will cost $0.21. The discounted “Metered Mail” category for First Class Mail Letters (1 oz.), which includes online postage providers and postage meters, decreased from $0.485 to $0.465. Each additional ounce will cost $0.21. First Class Mail Flats (1 oz.) decreased from $0.98 to $0.94….

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