how to use phpList with external (3rd party) SMTP servers

Like the title says I am trying to have phpList on my server and relay the messages through 3rd party service (e.g. TurboSMTP.com). I am having trouble finding any setting in the application or in any of the config files to allow me to set this.

From serverfault Filip Kierzek

• This is available under the config.php file which is under the folder /lists/config

  Scroll down to the mailer settings

  Search for the following code and modify your smtp hostname. Hope this helps.

  # If you want to use the PHPMailer class from phpmailer.sourceforge.net, set the following
  # to 1. If you tend to send out html emails, it is recommended to do so.
  define("PHPMAILER",1);
  
  # To use a SMTP please give your server hostname here, leave it blank to use the standard
  # PHP mail() command.
  define("PHPMAILERHOST",'');
  
  # if you want to use smtp authentication when sending the email uncomment the following
  # two lines and set the username and password to be the correct ones
  #$phpmailer_smtpuser = 'smtpuser';
  #$phpmailer_smtppassword = 'smtppassword';
  

  From hadi