In most cases, the path to pear can be left blank.
to help troubleshoot why the email is not sending, we can add some troubleshooting code.
In the Universal Email behavior, set the Go To address to be blank so that it will not redirect to another page after sending the email.
add the following code at line 1 to turn error reporting on:
<?php
error_reporting(E_ALL);
ini_set('display_errors','on');
?>
and add this code at the end after the closing </html> tag:
<?php
echo("<pre>");
var_dump($_SESSION);
echo("</pre>");
?>
send a link to your contact page after making these changes so I can test it.