Problems when forwarding from external email adress

Problems when forwarding from external email adress

Hi!

I've tried to configure a soloution with an external email adress that forwards it to support.company.zohodesk.com.
The forwarding works but gives some problems. 

When Customer sends an email to my external adress help@company.com it forwards it to support.company.zohodesk.com and creates a ticket. Good!
When the ticket creates I want the automation to send the automatic reply "Your ticket has been created" to my customer. The reply sends but goes only to help@company.com. How can I send it to the original sender?

Question 2, can I configure that every reply I do from desks mailservice begins with #original_sender {theoriginalsenderemailadress@theoriginalsenderemailadress.com} ?

Thanks!
Josef