I upgraded a few days ago, followed upgrade instructions for a zc without customizations and everything went smoothly.
The store was taking orders and sending the orders to the owner.
Even though the order emails were received to the orders email, the orders email is not sending out confirmations to the customers.

Spoke to fatcow who is hosting the site and there are no mail error logs to tell us anything.

Is anyone else having this issue and would appreciate some advice on how to fix it.

Thanks,