Quote Originally Posted by rep6400 View Post
Unfortunately, that is not about Zen Cart
Right. This is a problem in your hosting account. Log a support ticket with GoDaddy and get them to fix the problem.
They'll probably tell you to switch back to using "mail()", which in Zen Cart is the same as using the "PHP" transport mode. So do that for them. But then they'll have to assist in the process of tracing the email activity to see what's broken.