Version:           4.7 (using KDE 4.7.1) 
OS:                Linux

When updating dimap account from an account on my web host, I get repeated notifications:

IMAP Account 11: Append failed, server replied: A000795 NO Unknown namespace.

this also happens if  I manually run filters on that accounts folders.

I do not get any errors on a separate normal imap account, nor on my gmail accounts. 

Disabling disconnected mode does not remove the multitude of errors, but deleting the resource and re-adding it as a normal imap resource does.

Reproducible: Always

Steps to Reproduce:
Open  kmail, and check for new mail, or select all messages and run all filters on a folder in the account.

Actual Results:  
When it updates the resource, many identical errors pop up

Expected Results:  
No error messages

OS: Linux (x86_64) release 3.0.0-12-generic
Compiler: gcc