Love the simplicity, sadly TinyLetter has been bought out by MailChimp, which is a much more complicated beast to navigate, see:https://www.inc.com/maria-aspan/tinyletter-going-away.html
TinyLetter sent out email notice tonight about merging with MailChimp. So far they are keeping TinyLetter going but the plan seems to be to close it down at some point. So, if you have been using the service you may want to look for an alternative.
Our users have written 2 comments and reviews about TinyLetter, and it has gotten 21 likes