Apple Mail Follow Up - not working (when I would like it to)

leesider wrote:

A month or so ago, I started seeing certain emails to which I hadn't had an answer pop back up in my Inbox three days later. It was initially a bit disconcerting but, by and large, more useful than not. Then it just stopped. I have tried to reinstate it, without success. 'Enable Message Follow Up Suggestions' is ticked in Settings, but it isn't working. Most people seem to want to disable this feature, but I would actually like to make it work again! Thanks in advance for any advice with this.

New bells and whistle features usually have some associated growing pains—yes

To be proactive you can file a bug report /submit your Apple Feedback here: https://www.apple.com/feedback/mail.html