Turn off Reply reminder on email
Turn off the "reply reminder" feature on the account. Very annoying having popup to respond to an old email. This just started. Why was it added with no way to turn off according to your own tech support.
Kirk and Mimi Fisher commented
It is very annoying. There is a setting on your desktop to turn reply reminders on or off, but I've tried that and I'm still getting the annoying popups on my phone. You can try that setting and hopefully you'll have better luck than me.