Alfresco Logs show that the system IMAP is enabled.
However, when I try to connect Outlook the Error is "Log onto incoming mail server (IMAP): The connection to the server failed." I have checked the Ubuntu Machine to ensure that port 143 is enabled.
I think your imap.server.host is wrong … it should be the host/ip address that you want to bind the alfresco IMAP service to. I suspect kms.jstpl.com is another email server based on the fact that's what you have configured for outbound email.
At its simplest if your box is called "fred". then imap.serve.host should be "fred".