Auto populate the CC field

Auto populate the CC field

Hi there. I hope somone can help me.
 
We have 2 helpdesk email boxes here, one called helpdesk@ and one called servicedesk@
 
Basically, how do we configure Service desk to always add the servicedesk@ email address into the CC box when doing a reply from within service desk.
 
Is there anyway that we can do this?
 
Regards

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