After installing this plugin, users have been complaining about multiple emails for the same comment. I can attest to this as well from an admin perspective. I get multiples as well but found options to bring that number down. However, there does not seem to be anything to apply to the users. Site is http://www.thewellspringcollective.com. All other threads dealing with this issue have been closed without resolution (all threads that I could find anyway).