Problem with Roundcube
You might experience the following error with roundcube
Unexpected condition from IMAP server, closed or corrupt connection to IMAP. Possible mailbox corruption.
Even the imap service on the server is running fine on the server, you might face this problem.
The cause of this error is “ioncube” is not enabled on the server.
To sort this error you can do the following:
Login to WHM >> Main >> Server Configuration >> Tweak Settings >> PHP >> Select ioncube
Now try to access the emails with Roundcube. You should not face any errors now.