[Plugin: Formidable Forms] Not receiving emails

I am not receiving any emails from the form I created in Formidable… I love the plug-in and it works perfectly with my GoDaddy hosting. However, with another site I have hosted with Yahoo Hosting, I can not get it to send any emails. Did a test email using Ultimate Tinymce and got those emails, so my sight can send emails. I have tried other email addresses in the settings, still no emails from my Yahoo hosted site. What gives?

http://wordpress.org/extend/plugins/formidable/