the current settings should be simular to the following (update your website GSuite domain and password:
Code
public $Host = 'smtp.gmail.com';
public $Port = 587;
public $SMTPSecure = 'tls';
public $SMTPAutoTLS = true;
public $SMTPAuth = true;
public $Username = 'forum@EXAMPLE.com';
public $Password = 'PASSWORD';
Also see attached screenshot of /forums/libs/phpmailer/class.phpmailer.php