A recent trip to New Zealand to visit her pen pal of 40 years made an Associated Press reporter from New Hampshire wonder about the history of programs that bring strangers together to write letters. While the program that matched them as teenagers folded years ago, others are still going strong. And even though the government postal service in Denmark recently stopped delivering letters altogether, some see signs of a letter-writing resurgence. More than 15,000 people signed up for a pen pal program created by a writer for The New Yorker during the COVID-19 pandemic. Meanwhile, an app called Slowly that mimics the anticipation of receiving a letter by delaying digital message deliveries has 10 million users.