Impossible to send mail from mantis.

The config looks like below.

<?php

$Id$

# Debian default configuration file for mantis.

# Attention: You should NOT remove the following line, if using
# dbconfig-common/debconf to configure mantis database, nor should you
# change the database configuration by hand.
include("config_db.php");

$g_hostname            = "$dbserver";
$g_db_username        = "$dbuser";
$g_db_password        = "$dbpass";
$g_database_name        = "$dbname";
$g_db_type            = "$dbtype";

$g_administrator_email      = 'user@gmail.com';  
$g_webmaster_email        = 'user@gmail.com';
$g_from_email        = 'user@gmail.com';
$g_return_path_email    = 'user@gmail.com';

# Smtp
$g_phpMailer_method = 2;
$g_smtp_host = 'smtp.gmail.com:465';
$g_smtp_connection_mode = 'ssl';
$g_smtp_username = 'user@gmail.com';
$g_smtp_password = 'mypassword';
$g_stop_on_errors = ON;
$g_email_receive_own = ON;

include("config_local.php");

?>