That’s issue, I use smtp to send woocommerce mail, it’s ok, mymail plugin -> it’s ok.

But WPpizza -> error mail function.

Many hosting provider disable mail function in their share hosting plans, and it’s reason that we use smtp.

Your SMTP NOT WORKING, and that’s issue.

Your plugin “Delivery By Post/ZipCode” is so bad, too. I want “delivery charges per km” NOT “per item”, if charged for each item, the shipping cost is very high.