I put up a simple email test page and can't seem to get your server to send emails. You may be able to send this to your hosting provider to see if they can tell you what might be wrong:
https://performancehorseshop.com/emailtest.php
It may be that you have to use a valid email address from your performancehorseshop.com domain. I see the from address doesn't match the domain in your settings and I didn't know a valid email address to test with.