Send WordPress system mails via SMTP.

wp_smtp.php

<?php

function wp_smtp($phpmailer){
  
          $phpmailer->Mailer = "smtp";
	        $phpmailer->From = "System";
	        $phpmailer->FromName = "System Name";
	        $phpmailer->Sender = "no_reply@example.com"; 
	        $phpmailer->AddReplyTo($phpmailer->From,$phpmailer->FromName); 
	        $phpmailer->Host = 'smtp.gmail.com';
	        $phpmailer->SMTPSecure = 'tls';
	        $phpmailer->Port = 587;
	        $phpmailer->SMTPAuth = TRUE;
	        if($phpmailer->SMTPAuth){
	                $phpmailer->Username = "mailaddress@gmail.com";
	                $phpmailer->Password = "passwordhere";
	        }
	}
 
add_action('phpmailer_init','wp_smtp');