A friend of mine dropped out of university and went to live the "ski-bum" lifestyle in France. His mum wasn't happy with this and eventually took to writing let

A friend of mine dropped out of university and went to live the "ski-bum" lifestyle in France. His mum wasn't happy with this and eventually took to writing letters to him addressed "Joe and his stupid friends, Chamonix". They all arrived without issues. This was in the early 90's. I wonder how effective this would be now with more automated systems in use.