Respond Card: Why should you send a Respond Card? Response cards are a convenient way for your guests to reply and it is also a good way to let you know who is coming. It may also save you money on your reception costs, because you will know for sure how many guests are coming. If you are offering a meal choice, this can be indicated on the response card. Each respond card will come with an envelope with your name and address on it. If you are following etiquette, you have a choice whether to place a stamp on it or not. Most people do affix a stamp on it.