Email is good.

It’s worth a read for being funny and relatable in certain ways.

I need to communicate with thousands of people all over the world as I write my books. I also want to be responsive to the people who read those books and have questions or comments. My goal is to do this communication efficiently, in batch mode — like, one day every six months. So if you want to write to me about any topic, please use good ol’ snail mail and send a letter

I would suggest that if you’d like to adopt such a strategy yourself, first you become well-known professor with a famous book and be distinguished in your field. This will ensure you are financially stable for life and your co-workers will forgive you for absolutely never knowing what is going on.