I originally noticed the IMAP session failing on outlook express with a timeout error collecting the body of the email. So after further digging using other clients (thunderbird etc) I tested the connection over telnet.
I have reason to believe that the ISP is intercepting emails. Is there a way of proving that they are using a proxy to do this or some other device. I have a client that is with a certain ISP and when they initiate an IMAP session even using telnet, they are unable to retrieve the body of the email. The same mailbox works on any other connection and if you connect over VPN then the IMAP starts to work.
This scenario is being played out on mutliple connections from the same broadband provider from different locations and on different computers.
Also on any other connection using a different broadband provider the imap works perfectly, but I need to prove to the client that something is happening with the connection that is intercepting or altering the way IMAP is handled, thus causing the error.
Any help would be greatly appreciated.