[RESOLVED]sendmail_from error

[rasana]

Hi All,

I have written mail() function in php, but it gives following error

Warning: mail(): "sendmail_from" not set in php.ini or custom "From:" header missing in d:\websagar_projects\php\www\websagar_net\order_form1.php on line 45

I checked apache server n restarted also..but it's not working..
what does this error means?
is this error related to mailserver?

following is coding of mail()

$sendto = "[email protected]";
        $frmEml = "veena";
        $headers = "From: $frmEml \r\n";
        $subject = "$plnName Enquiry Form";

       mail($sendto, $subject, $frmdata, $headers);