I really like this plugin but it's not working for my 2 sites. I've installed the plugin on my sites then I used the option 'send email to old comments' but no email was sent to my commentators including NEW comments. I still leave it activated for 2 weeks, reinstalled it but still it's not working. Can you give me advice on what to do and if possible what are its plugin incompatibilities? This is a nice project that's why I want this on my sites.