"Path to PEAR was blank - does anything need to go in there?"
depends on your host. if the path to pear is properly set in the php.ini file, it can be left blank. if not, you need to enter the path to pear. you should contact the hsot.
for troubleshooting purposes, make sure that there is no redorect to another page after sending the email, then add teh following code at line 1 to enable error reporting:
<?php error_reporting(E_ALL); ini_set('dispplay_errors','on'); ?>
and add the following code in the body of the page:
<?php @session_start(); var_dump($_SESSION); ?>
this will write the session to the page including the email status.