See details about the 2009 rate increase. On Monday, May 12th, the United States Postal Services (USPS) is raising postal rates. The new rate for a first-class letter will increase from 41 cents to 42 cents. Flat-rate Priority Mail envelopes will increase from $4.60 to $4.80. High fuel prices are the likely reason for the rate increase. The rate increases effect all parts … [Read more...]