We've set up the email fetching so that only registered users can create tickets via email. Users can CC people to have them added as collaborators.
However we've realized that collaborators don't follow the same "registered-only" setting and will have their account created as guest when CC'ed and not yet registered. Also that means that if the email address is misspelled, the user will still be created with the wrong address...
Is there a way to prevent these guest accounts from being created? And thus skip those collaborators?