When you offer your customer the opportunity to contact you through a contact form, it is sometimes the case that the e-mail is sent to you with your own e-mail address. You can not respond quickly by answering to this email, but must first apply the e-mail address of the customer. You can do this at "Starting point > My Webshop > My pages > Edit content" you can change the fields that are displayed on the contact form at the "Contact page". The e-mail address field must be of the type 'Email'. When your customer completes a form, the system will use this field as the sender address.