kde 4.9.5-kmail not able to open mails (display them) from the mail list, or forward them.

When clicked on the mail list, the mail-view pane shows "Retrieving the folder content...." and for a long long time is stuck there. When the program is opened for the first time, normally the view appears after a minute, but after running for some time, it will never appear.

Similary, when a mail is selected and forward is clicked , "please wait,mail is being transferred" progress bar appears and the transfer may never happen or if happens, the forwarded mail is never sent.

Is this only my specific experience ?