What system are you using for the emails being sent. I have my joomla set to phpmailfunction for the most part, but I set it to sendmail and other modules are sending out, only this one is not.
I also looked on the server, and there is no mail going out as \"nobody\" etc or any mail stuck for delivery.
Switch your global config mail setting back to \"PHP Mail Function\", which is the default. You shouldn\'t need to change that. Switch it back and let us know if that fixes it for you.
My emails wouldn\'t get sent until I deployed on a live site, it seems that the mails get sent after a successful Instant Payment Notification from paypal hits your site.
Site is live, module is live emails are not being sent... other modules in the same site that send emails are sending emails (contact form, chrono forms, user signup....)
I will do more testing, but if you can think of anything let me know.