how to use mail function in php | mail in php | mail code in php | mail script in php    <?php  $to  = 'saddam1234321@gmail.com';  $subject = 'test mail';  $message = 'this is dummy mail';  //mail(to, subject, message, header, variable)  mail($to, $subject, $message);  ?>     1 To is reciver email adress  2 subject is short text  3 message is brief dicustion