Sandboxx folks are a fine bunch of people. It was started by a Marine vet, who I introduced to the delights of eating at the Iron Rooster in Annapolis a few years back. They are a for-profit company, but have a reliable and user-friendly concept: write a letter online, they turn it into a mail-friendly paper format, offering the pleasure of opening actual mail by hand. For those of the generations who struggle to find paper, envelope, pen, stamp, and have to look up where to put stamp and write an address, this is an ideal way to pump out a real paper letter from a website or phone app. It’s a great way for friends to support peers in the military.