Add Email field to the admin notification emails

I'm trying to add the code to show the customer's email address in the Customer Information section of the admin notification email.

I found the email code in media/com_hikashop/mail, but don't know what code to add to show the customer's email address.

Could someone supply it?

Thank you.

You can do like that:
www.hikashop.com/forum/4-how-to/26345-em...s.html?lang=ja#27587