Mail Function

Hello All, I have a question. I installed PHP on a windows XP machine. When I try to send a form it says: "Warning: mail(): sendmail_from not set in php.ini or custom "From: header. My header are as follows: <? require ("admin/inc/setup.php"); $subject = "FeedBack From Site";

$msg = "Senders Name:       $_POST[name]\n";
$msg .= "Senders Email:     $_POST[email]\n";
$msg .= "Message:           \r$_POST[message]\n";
$mailheader .= "From:       $_POST[email]\n";

$mailheader .= "A message has been sent from Domain"; mail($recipient, $subject, $msg, $mailheader); require ("tmpl/send_form.htm"); ?> The recipient is in the setup.php file, just to let you know. My sendmail_from is as follows: sendmail_from = me@mydomain.com Please help :) ~WILL~