Can i use postcard stamps for regular mail

In the United States, the answer is generally no, you cannot use postcard stamps for regular mail. Here's why:

  1. Denomination: Postcard stamps are typically designed for a specific denomination, usually 35 cents or 55 cents, which is the current cost of mailing a postcard within the United States. Regular mail, on the other hand, requires a stamp with a denomination that matches the current first-class mail rate, which is currently $0.55.
  2. Adhesive: Postcard stamps are designed with a special adhesive that is meant to stick to the postcard, not to a larger envelope. Regular mail requires a stamp with a more robust adhesive that can stick to a heavier envelope or package.
  3. Perforations: Postcard stamps often have perforations (small holes) along the edges, which make it easy to tear off a corner and attach the stamp to a postcard. Regular mail stamps usually don't have perforations, as they're designed to be attached to a larger envelope or package.

That being said, there are a few exceptions:

To be safe, it's always best to use a regular first-class mail stamp for regular mail, as it ensures that your mail is properly processed and delivered.