email notifications not sending

Hi

I've got a site set up with Easy Blog, Easy Discuss and Easy Social. However, I can't seem to get the notifications by email working on Easy Discuss. We have a cron job set up on the site and we also have Easy Blog set to send notifications on page load and these are working so I'm struggling to understand what's going wrong. I've checked the notification settings in Easy Discuss and these are set to notify admins and moderators on new posts and thread subscribers on reply but none of these are working.

Please can you help?

Jamie