I am having the same issue right now, I am running VFB Version 2.9 Free, PHP Version 5.4, WordPress 4.5.3, and all emails are within the domain. We have basic POP email setup. Im not 100% sure what changed with in the last week or so but for some reason we do not receive any of the form emails but the clients receive their auto reply email. It had been working for about two years then just stopped...?
Thanks
Joshua