[imp] logon failures

[Geoff Sweet]

I have users that are getting logon failures.  The IMP logon pages
suggests that it may be bad username or password.  When I use the
horde/test.php and enter in the same info I get:

server="localhost" user="kelly at domain.com"
mailbox="{localhost:143/imap/notls}INBOX"
array(4) {
  [0]=>
  string(13) "Login failed."
  [1]=>
  string(13) "Login failed."
  [2]=>
  string(13) "Login failed."
  [3]=>
  string(23) "Too many login failures"
}

and the horde.log generates this error:
Dec 24 10:28:09 HORDE [error] [imp] FAILED LOGIN 12.229.173.73 to localhost:143[imap/notls] as kelly at domain.com [on line 281 of "/home/whosting/horde/imp/lib/IMP.php"]

I saw some previous message threads that this could be IMAP login issues.
I am currently using the latest stable of Courier.  This is my servers.php:

$servers['cyrus'] = array(
    'name' => 'Whootis.com Hosting',
    'server' => 'localhost',
    'protocol' => 'imap/notls',
    'port' => 143,
    'folders' => '',
    'namespace' => 'INBOX.',
    'maildomain' => '',
    'realm' => '',
    'preferred' => ''
);

So far I am not seeing anything wrong... anyone have any ideas?

Thanks
Geoff