On May 12, the U.S. Postal Services will raise the rates for postage. After the 12th, a First-Class Mail stamp will be 42¢.
Make sure that your beautiful invitations don't arrive marked "postage due!" If you plan to send your wedding or event invitations soon, make sure that you have affixed proper postage to both your outer envelope and your response card.
Customers can continue to use the Forever Stamps that they purchased prior to May 12 at 41¢, even after the price change. You can learn more about the increase here.