[PHP-INSTALL] php send mail

[kengaun]

I have the following php code

<?php

mail("[EMAIL PROTECTED]", "My Subject", "Line 1\nLine 2\nLine
3");

echo "mail send  ?";

?>

I got the following error code:-
[28-Jul-2004 16:57:14] PHP Warning:  mail() [<a
href='function.mail'>function.mail</a>]: &quot;sendmail_from&quot; not set
in php.ini or custom &quot;From:&quot; header missing in
D:\OFI\mail_test2.php on line 3

I am running using IIS, php5b4

Please help to advise what need to install and modify the ini file ?