no mail if I use $header

[mykg4orce]

If I use the $header var in mail function i can not send mail to any address.

I am using hostrocket as a host.

I am trying a very simply script.

$to = "[e-mail]";
$body = "hello";
$subject = "hi there";
$header = "From: The Sender <[e-mail]>\n";

mail($to, $subject, $body, $header);

What could be the problem? If I take out $header, the email sends fine.

[liquorvicar]

What MTA does your host use? I know sendmail can be configured not to let the web server user set the From address. If you are using sendmail you might want to try setting the 5th parameter as well like this:

mail($to, $subject, $body, $header,'[e-mail]');

The -f flag in sendmail set the from address.