I'm trying to send an email notification to user after checkout is done and order placed. I've gone through the WooCommerce email settings and set them all accordingly. But for a reason that I don't know of email couldn't be sent. I understand this is not a code related question.
...And this is the warning I get in the log plugin to check whether emails have been sent: " Could not instantiate mail function ".

This happens due to your site haven't been configured with email service provider like Google/SendGrid or SMTP. In my case, I used SMTP with the help of WP Mail SMTP plugin, and it works for me. Example configuration can be found below:

Hope it helps
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