Until 4 days ago, emails were being sent to subscribers for all new posts. As of 2 days ago, no one, myself included, received an email for a post published that day. I published another post today, and received an email at my administrator account, but not at another address for which I signed up. So emails do not seem to be going to out to general subscribers.
I have seen advice that says to set the number of subscribers to 1. Perhaps I misunderstand, but why would I only want one recipient per email? It says to set to 0 for unlimited recipients. Nevertheless I will try that for my next post to see if it makes a difference. Could there be another problem? I did not change any other settings before this problem occurred.