mail function from and reply to address problem

I am currently running PHP 5.1.4 Fedora Core 5 i'm trying to exectute the following test script. <?php

$to      = 'my.email@address.com';

$subject = 'the subject'; $message = 'body'; $headers = 'From: webmaster@domain.com' . "\r\n" . 'Reply-To: webmaster@domain.com' . "\r\n" . 'X-Mailer: PHP/' . phpversion(); mail($to, $subject, $message, $headers); ?> i have about 10 or so different virtual hosts running on this machine, and if i use any of them for the from & reply-to addresses, it works fine, or even if i use domains I don't control like aol.com or example.com those work too, but one particular new virtual host doesn't work, it re-writes the from address to the default virtual host address. which is strange because that isn't in the php.ini anywhere, but it could just be taking the hostname. anyone have any ideas? thanks in advance. Tanner