I tried sanebox as well but I did not re-subscribe. It is a good service but I have also created rules, filters, and smart folders. It works perfectly and there is no need for a subscription. I did use the reminders feature but that is also available as an extension in Apple mail. However, I have a simpler solution that I have implemented. I created a flag called “waiting for.“ I tag messages that I’m expecting or needing a reply from and then periodically check the flagged folder. When I receive a reply I simply clear the flag for the message and it disappears from the rules-based folder. It’s quick, easy, always accurate, and completely free. 
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