I've set the following setting:
At "The email address in the 'From' field.", I've selected "User email".
The reply e-mail address in the email I get from the form, is still email@example.com, instead of the users e-mail address.
This makes it more difficult to reply since I need to enter the users email manually every time.
The user NAME is filled in correctly.
So when I hit reply to answer a message it goes to:
"Username"<firstname.lastname@example.org> where username is different every time but the email is always this.