I have made a form on mu webpage and when submitting there is another php document that handles the data...

By using the mail () function I tried to send an email to myself but no matter how hard I tried with different code no mail came...

The code looks like this:
<?php

$to = "my@email.com";
$subject = "test";
$message = "just a testmessage";

mail( $to, $subject, $message ) or print "Could not send mail";

?>

My Server is a RedHat 9 Linux Server. I found some texts telling me that UNIX systems uses Sendmail instead and that I needed to configure this?
Well how do I do that and do I need to do that?

Thx for answering...