It will only work under the right circumstances Rated 2 out of 5 stars
Unfortunately this addon only appears to work if you never leave unread emails in your inbox. I've tried all different combinations of settings and it will either constantly notify me of my unread mails every 5 minutes or else it will fail to notice that a new mail has arrived.This review is for a previous version of the add-on (1.31).
Please read the help in the Add-on. This will help you understand how it work.