Mail From header

Could some one point out why isnt the From: header working? Instead I am receiving something like myhost@conf....

<?php


$send=$_POST['send'];

if ($send){


$to="example@hotmail.com";
$subject=$_POST['subject'];

$headers = 'From: webmaster@example.com';

$firstname=$_POST['firstname'];

$body=$_POST['message'];

$mailers_name=ucwords($firstname);

if (!mail($to,$subject,$body,$headers)) 
    {
        header("LOCATION: http://www.mysite.co.uk/success.php?none=not");

}else {

    header("开发者_如何转开发LOCATION: http://www.mysite.co.uk/success.php?none=yes");

    }
}
?>

I believe you need \r\n in there at the end

$headers = 'From: webmaster@example.com' . "\r\n";

OR

$headers = "From: webmaster@example.com\r\n";

From the user notes at the PHP manual for mail, the following was posted by me at arronwoods dot com:

I've had all sorts of problems with scripts that don't set the "-f user@example.org" parameter when using mail() if postfix is the sendmail agent.

In postfix I had SMTP relay authentication based on the sender address, but it was always the PHP user as the sender until I adapted the code from:

<?php mail('test@example.org', 'Subject', 'Body', 'From: user@example.org'); ?> 

to:

<?php mail('test@example.org', 'Subject', 'Body', 'From: user@example.org', '-f user@example.org'); ?>