Although it seems appears that you can turn off Klamav via the Kmail filters, in fact this does not prevent it from running, it just means that the "X-Virus-Flag: no" line does not prefix the email. Duplication and corruption are still present.
So I uninstalled Klamav. This fixes both duplication and corruption. It also ends the "freeze" that stops Kmail from doing anything while downloading - there is another bug for this I think. Andy Goss -- To UNSUBSCRIBE, email to debian-qt-kde-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org