osTicket modification (add static copy email - easy with php skills)

Hello, I am looking for someone who tells me where to insert a static email to mailscript of a ticket system (osTicket). I am using the smtp mail function and would need a copy of every email send by OsTicket being sent to a static email address. As this email always stays the same it can be simply copied somewhere in the php code. In my old installation it worked like this, but as I have no idea of php I would need some advise where to add the email in the new code of osTicket. In the attachment you find [login to view URL] where I suppose the email+code must be added. For testing you can get all files at the osTicket homepage. For someone who understands php-language it should be easy. Thanks a lot and kind regards, Stefan