I have had the same problems with godaddy's mail() (error: could not instantiate mail function), with the same settings listed at http://www.zen-cart.com/forum/showthread.php?t=79854. I have one domain hosted on were it works just fine. The second domain hosted with godaddy with the same setup does not work. I called support and asked them if there was something they could reset or fix and they could not fix the problem.

I fresh installed everything with the exact same code and one works and the other does not. I have searched through the godaddy help and all over the internet and can not find a solution. I have called support and they could not help me. I searched through the godaddy hosting settings and could not find any settings that I needed to activate. I am not sure what to do now. I can't have a contact form without it. Thanks in advance for your help.