Hey knotties, this may be a dumb question, but I'm going to ask it anyway! We are looking at postcard STDs, kind of like a 4x6 picture with the details on it, but they come with a thin envelope. I kind of like this idea so it protects our info a little more than just sending a postcard. Does anyone know what kind of postage is required? If it fits the size rules of the postcard, can we use postcard stamps or is it treated as a letter when it gets an envelope?