[otrs] Auto CC

Hello all, I migrated from 2.2.6 to 2.3.4 on another system. The 'cc' field now seems to be auto filled with the OTRS email so when an agent replies it sends the email to OTRS and an extra reply gets added to the ticket (ie, it email itself). Can anyone tell me where I can find the config parameter to stop this from happening? Thanks, Josh.