Adding a Reply-To in the header of my contact form

Hello,

I would really like to be able to click reply and it populate the email address that was submitted on the contact form.

My hosting provider does not allow sending from domains other than the one hosted…so I have implemented the code mentioned in the documentation:

function change_cf_from() {
    return " (Email address hidden if logged out) ";
}
add_filter('avf_form_from', 'change_cf_from', 10);

Now the emails come through, but I cannot reply directly to user who submitted. I know you guys usually recommend Contact Form 7…but I would really prefer not to use any additional plugins. I have been trying to follow this previous support ticket with no success (It is a year old so maybe the coding is different).

Any help would be greatly appreciated!