[Wed Jun 17 17:32:07 2009][Error][Kernel::System::MailAccount::IMAP::Fetch][72] IMAP: Can't connect to <server address>

In my log <server address> is the correct IP address of the server, the same used in Outlook Express.

What I'm missing?

Shooting from the hip... name resolution, IP connectivity, & firewall configuration would be the first couple of things I'd think.