There are many events in Zen Cart that send emails. You should always test them all on your live site before taking orders, just as you should test all functions/features of the software to be sure they're operating as you desire.
Whether you have the Email Friendly Error message on or off, doesn't determine whether you can send emails or not. That only determines whether you get a blank screen showing an error message or whether the error message simply shows at the top of the next page in a red bar. Focusing on that setting is not going to solve whether the email system works or not.
I had asked what your email settings are. But since you don't want to share those, I'll just point you to general email-troubleshooting tips: http://www.zen-cart.com/wiki/index.p...Email_Problems



