how to clear cc field when reply request

how to clear cc field when reply request

Users can create requests via mail, works fine. they send to it-servicedesk@.
 
Problem:
When technician wants to reply in servicedesk the cc-field says it-servicedesk@..
 
How do i prevent this to happen..??
 
Kinda big problem because.. mailfilter catches mail ad sends back to servicedesk witch creates a new request..

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