Sorry for the trouble with your email function. I was able to make a test.php page in your public_html and verify the email function is working. I checked the DNS MX records for your domain and its correct also. We checked your email logs and did not find any problematic emails.
We would like to look further into this; however, because this is an Open forum, you will not want to pass personal information through this medium. If you could please contact support with the login information and steps to replicate the problem, we can check the Apache logs on the fly to see if anything is causing the site to break. Sorry for the trouble.
Figured it out. I change my email address to a domain hosted in Inmotion. Before, I was using a yahoo email and it works perfectly fine. Maybe your system now implement such restrictions.