problem in sending mail through mail function in php

[Teranoz]

still throw ing warning s

Warning: mail() [function.mail]: SMTP server response: 550 5.7.1 Unable to relay for [email protected] in e:\amit\wamp\www\pp\dd.php on line 15

This means it does work but is not allowed, because the server does not allow that gmail address as sender.
Try using a valid email adres with the domain of the website.