How about your parents or local/state politicians? Interestingly, those tend to be the top two use cases for letters sent from people without accounts. (The oth

How about your parents or local/state politicians? Interestingly, those tend to be the top two use cases for letters sent from people without accounts. (The other major use case is invoice/receipts and snail mail marketing -- but that tends to be solely through the API, which requires an account.)