[imp] Need help about IMP

[User HCHEN]

Hi all,

The error is described as FAQ 5.3.14
(http://www.horde.org/faq/admin/trouble/index.php#t35)
Here is the section of my servers.php, what is possiblly wrong?

$servers['imap'] = array(
    'name' => 'IMAP Server',
    'server' => 'localhost',
    'protocol' => 'imap/notls',
    'port' => 143,
    'folders' => 'mail/',
    'namespace' => '',
    'maildomain' => 'mydomain.us',
    'smtphost' => '',
    'realm' => '',
    'preferred' => ''
);

Thanks in advance.

H.C.