$whitelisted_domains = array('@gmail.com',
	'@yahoo.com',
	'@hotmail.com',
	'@live.com',
	'@aol.com',
	'@outlook.com',
	'@ymail.com',
	'@mail.com',
	'@live.ca',
	'@hotmail.co.uk',
	'@msn.com',
	'@aim.com',
	'@att.net',
	'@yahoo.co.uk',
	'@web.de',
	'@googlemail.com',
	'@yahoo.ca',
	'@hotmail.ca',
	'@live.jp',
	'@yahoo.de',
	'@hotmail.de',
	'@gmx.com',
	'@gmx.de',
	'@email.com',
	'@sbcglobal.net',
	'@rocketmail.com',
	'@live.co.uk',
	'@live.nl',
	'@live.dk',
	'@hotmail.fr',
	'@outlook.de',
	'@live.de',
	'@live.com.au');
	if(!in_array('@' . end(explode('@',$email)), $whitelisted_domains)) {
		echo "That domain is not allowed! You may only use emails from the following domains:<br /><br />";
		foreach ($whitelisted_domains as $item) {
        		echo $item . "<br/>";
		}
		exit;
	}