email sending problem

[Sharmin]

Hi,
I am Sharmin Sultana From Bangladesh using mantis . I am new in this field and i have set up all the things of mantis using administrative guide but , having problem with sending email which is very important for using mantis.

I do some change in config_inc.php page....... My code is below
?php
$g_hostname = 'Sharmin';
$g_db_type = 'mysql';
$g_database_name = 'bugtracker';
$g_db_username = 'root';
$g_db_password = '';

$g_allow_signup = ON; //allows the users to sign up for a new account
$g_enable_email_notification = ON; //enables the email messages
$g_phpMailer_method = PHPMAILER_METHOD_SMTP;
$g_smtp_host = 'smtp.gmail.com';
$g_smtp_connection_mode = 'tls';
$g_smtp_port = 587;
$g_smtp_username = 'example1@gmail.com'; //user gmail address
$g_smtp_password = '*******'; //user gmail password
$g_administrator_email = 'example@gmail.com'; //this is my administrator email address


?>

******what's the problem...please help me...its urgent