The remote host is running an inherently insecure protocol or application.
The remote server is a Nokia Intellisync web portal. These portals are designed for access by users of portable devices (PDA, cell phone, etc.). A user can configure their POP/IMAP mail servers, accounts and more via this interface. Intellisync supports an option for forcing these communications over an encrypted (SSL) channel. This is the recommended configuration.
Ensure that clients are forced into an SSL channel.