this site http://itali ansan tacla rita(dot)com/cart is built on OpenCart platform.
The issue is has is that its hosted on Godaddy shared hosting. The mail server doesn't send mail instantly on the shared hosting so I have setup a smtp account with SEndGrid to use for sending order alerts and mail from the cart.
I have tested the smtp account with Outlook and it is working, but returns errors when used in the cart.
Here is a sample error
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