how does ¨contact us¨work?

Hi, I have my site live, and there are some customers contacting me via the ¨contact us¨page. I receive an email in my store mail account sent by my own store mail, with the customer comment and name, but no other reference to his/her email (that must be entered at the moment of contact, as it is a required field). Neither I can´t find in the admin dashboard, nor in the database where is this information stored...so basically I can´t reply to my customer.

Any help?

F.