We recommend that you do not mail cookies with custard or custard-like fillings or toppings, including Cheesecake Bars or Nanaimo bars. The custard could spoil, making a very unwelcome gift. Cookies that have a crunchy or hard texture such as Biscotti , Mexican Wedding Cakes, Crisps, Springerle , and Shortbreads make excellent choices for mail delivery. They tend to be fairly sturdy, so you don't have to worry too much about breakage. And since they already have a fairly dry texture, drying out isn't much of an issue.
Pack cookies in a sturdy tin or airtight container.
On the bottom of the container place a piece of bubble wrap, then line the container with parchment paper or cellophane, leaving enough to tuck over the top once the container is fully packed. Place one layer of cookies in the container. Cover with parchment paper. Arrange another layer of cookies, followed with more parchment paper, and continue this layering until the container is full. Tuck the cellophane or parchment paper over the top, then place another piece of bubble wrap on top, and seal your container.