On May 11th, the U.S. Postal Service will raise the rates for postage. Starting on May 11th, a first class stamp will be 44¢.
Make sure that your wedding invitations aren’t returned to you with insufficient postage. If you plan to send your wedding invitations soon, make sure that you have affixed proper postage to both your outer envelope and your response card envelope.
You can continue to use the forever stamps that were purchased prior to May 11 at 42¢, even after the price change. You can learn more about the increase here.