Right, so your wanting to use PEAR for mail sending, but are having problems after installing your own libraries from within cpanel, so heres what you do;
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add the following at the top of your sending script:
$path = '/home/cpanelusername/php'; (Replace cpanelusername with your own cpanel user name)
set_include_path(get_include_path() . PATH_SEPARATOR . $path);
Then try
require('Mail.php');
it should load it properly.