Problems Sending Mail

Hi There,

I am using Perch Mailing Functionality. i have send mail to someone but recipient doesn't get mail but all details are saved in Forms/Categories section in every time.

Does any setting I have missed it.

I am using these following settings..

<?php define('PERCH_LICENSE_KEY', '******-******-******-******-******');

define("PERCH_DB_USERNAME", 'UseName');
define("PERCH_DB_PASSWORD", '***********');
define("PERCH_DB_SERVER", "localhost");
define("PERCH_DB_DATABASE", "DBName");
define("PERCH_DB_PREFIX", "perch2_");

define('PERCH_TZ', 'UTC');

define('PERCH_EMAIL_FROM', 'abc@gmail.com');
define('PERCH_EMAIL_FROM_NAME', 'Name');

define('PERCH_LOGINPATH', '/perch');
define('PERCH_PATH', str_replace(DIRECTORY_SEPARATOR.'config', '', __DIR__));
define('PERCH_CORE', PERCH_PATH.DIRECTORY_SEPARATOR.'core');

define('PERCH_RESFILEPATH', PERCH_PATH . DIRECTORY_SEPARATOR . 'resources');
define('PERCH_RESPATH', PERCH_LOGINPATH . '/resources');

define('PERCH_HTML5', true);
    define('PERCH_EMAIL_METHOD', 'smtp');
define('PERCH_EMAIL_HOST', 'smtp.gmail.com');
define('PERCH_EMAIL_AUTH', true);
define('PERCH_EMAIL_SECURE', 'ssl');
define('PERCH_EMAIL_PORT', 465);
define('PERCH_EMAIL_USERNAME', 'abc@gmail.com');
define('PERCH_EMAIL_PASSWORD', 'password');

Please Any help is really appreciated. Thanks