Recently changed from Pop3 to imap and keep getting this message. I receive mail OK but it keeps re-highlighting. I have changed the Server Timeout setting to the max of 5 minutes. Any solutions please.

Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems or a long period of inactivity

This IMAP command could not be sent to the server before the connection was terminated.

Configuration:

   Account: tw

   Server: imap.1and1.co.uk

   User name: *** Email address is removed for privacy ***

   Protocol: IMAP

   Port: 143

   Secure(SSL): 0

   Code: 800ccc0f