If you want to use SMTP with your PHP List installation. You must add these lines to you config.php file, which should be in the root directory of your installation. I had to look several places to find this information. Pay attention to the port you are using, the wrong port number will keep your installation from working.
define(‘PHPMAILERHOST’, ‘yourwebsite.com’);
$phpmailer_smtpuser = ‘youremail@somewhere.com’;
$phpmailer_smtppassword = ‘email_password’;
define(‘PHPMAILERPORT’,‘587’);
define(‘PHPMAILER_SECURE’,‘tls’);