Stop managers getting emails from assignment submissions

Moodle 2.7

I have a role which is created from the Manager Role and is category based.  The users in this role are getting emails each time a student is submitting work or completing a quiz.  I can see where the capability is to stop an email from a quiz being sent to the manager, but I can't find where to stop them receiving emails when a student submits work.

Can someone tell me where it is or how to turn off them.  I don't want to turn the email teacher option off in the assignment itself as the teachers till needs to get the email.

Thanks

Kieran