FIX: Wordpress Not Sending Emails Issue
https://mweducator.com/wordpress-not-sending-emails
If Your Wordpress is not Sending Emails, then you are at right place. Actually by default Wordpress uses PHP Mailer as a Mailer Protocol so you will have to Setup an SMTP Server to Send or Receive Emails through your Web Application.
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Download plugin https://wordpress.org/plugins/wp-mail-smtp/
It's really a puzzle why WordPress or PHP for that matter, haven't already solved the issue.
It's bizarre that a built-in PHP function doesn't work!
Useful article, and luckily the WordPress community solved the problem on their own.