e-newsletter error when test connection

I was setting e-newsletter plugin and when I asked to test the connection I've got the following error:

<b>Warning</b>: imap_open() [function.imap-open]: Couldn't open stream {mail.innovadeal.com:587/pop3/notls}INBOX in <b>>/*my full path*/wp-content/plugins/e-newsletter/e-newsletter.php</b> on line <b>1115</b>
ESMTP Exim 4.69 #1 Wed, 31 Aug 2011 22:31:41 -0400

The line 1115 on e-newsletter.php has the following information:
$mbox = imap_open ( '{'.$email_host.':'.$email_port.'/pop3/notls}INBOX', $email_username, $email_password ) or die( imap_last_error() );

I am using:
wp 3.2.1
e-newsletter 1.0.7
the website is not on the roof and the sub folder has underscore on it /XXX_XXX
I've used all the Mail Client Configuration information from the hosting (iWeb) cPanel.

any idea?
Thanks