Could you please go to
joomdonation.com/support-tickets.html
submit a support ticket sending us super user account of the site and link to registration form so that I can take a quick look at your setup to see why emails are not sent to registrants
This is a public forum, so please do not send super user account of your site here. Please go to
joomdonation.com/support-tickets.html
and submit support ticket as I said (support tickets is private area)
