error messege when customers checking out

My customers are receiveing this error messege when they check out Email Error: SMTP Error: Could not connect to SMTP host. The weird thing is i am getting an email saying the order went thru from authorize.net also its charging thier card.but when i log onto admin section there is no order showing, just the customer information. I have not yet installed the new patch. Version is
Zen Cart 1.3.8a
Database Patch Level: 1.3.8 Go Daddy is my Host. This problem started after uploading authorize.net to another website i have. The other website is zencart but i am not having any problems with that one.
THANKS, Ron

Sounds like a problem with sending the confirmation email to the customer. This wouldn't get in the way of the authorize.net transaction or its confirmation back to you, as that all happened earlier in the process.

Email servers are a bit of a black art, and not one in which I'm expert. But I recommend wandering over the Admin > Configuration > Email Settings on both your sites and comparing the one that works to the one that doesn't.

Thank you I changed my email settings and it is working properly now. thanks for your help.:smile: