I am not sure this helps, but I managed to get this to work by:
a) Not amending anything in the eform.inc.php file - e.g. leave that as it is from the original MODx install, instead add in the code below (replacing what is already there) in the class.phpmailer.php file
var $Host = "smtp.gmail.com";
/**
* Sets the default SMTP server port.
* @var int
*/
var $Port = 465;
/**
* Sets the SMTP HELO of the message (Default is $Hostname).
* @var string
*/
var $Helo = "";
/**
* Sets SMTP authentication. Utilizes the Username and Password variables.
* @var bool
*/
var $SMTPAuth = true;
/**
* Sets SMTP username.
* @var string
*/
var $Username = "
[email protected]";
/**
* Sets SMTP password.
* @var string
*/
var $Password = "password";