How to set the reply mail address to the assigned technician's email address instead of the reply-to address which is set in the Mail Server Settings?

How to set the reply mail address to the assigned technician's email address instead of the reply-to address which is set in the Mail Server Settings?

Dear Support,
 
I've faced the inconvenient situation in our customer's site.
 
The situation is when technician replying to the requester by click the reply button and type the message to communicate to the requester, the SDP send this message to the requester properly but using the email address which is set in the reply-to address in the Mail Server Settings instead of using the technician's email, that's cause the requester confuse if he would like to reply this message it will send to the reply-to-address not the technician email address.
 
Please give me an advice how to set the reply mail address to the assigned technician's email address instead of the reply-to address which is set in the Mail Server Settings?
 
 
Best Regards,
Narin Chaipredanan
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