This documentation page is for Quform version 1 and may not be applicable for Quform 2 click here to visit the documentation for Quform 2.
To enable the sending of an autoreply email, you should have at least one Email Address element in your form and then, in the Form Builder, go to Settings → Email → Autoreply email settings. Tick the box Send autoreply email and then you can configure the autoreply using the new options that appear.