Also please confirm other functionality with mail is working or not?
So the issue, like usually wasn't Magento's fault. Our server HELO reply was localhost.localdomain, because of incorrect sendmail ...
magento-engcom-team commented on Nov 2, 2018. Hi @swnsma. Thank you for working on this issue. Looks like this issue is ...
In the backend shows (The order confirmation email is not sent),
Identifies the template that is sent to confirm new orders placed by guests.
It's possible that the "From" address is wrong. Goto Stores->Configuration-> General->Store Email Addresses and check if "Sales ...
template in the New Order Confirmation Template for Guests that is sent to those who
Order Confirmation Email extension by MageComp sends an order
For New Order Confirmation Template for Guest, select the email template that is sent to the guest users who do not have an account in the ...
The compete guide to set up Magento 2 order confirmation email template and