Comment 8 for bug 883459

OK - I think that this other bug report (<https://bugs.kde.org/show_bug.cgi?id=283682> - KMail duplicates filtered messages) matches both the problem and the version of KMail you are using. (It may be a bit difficult to reproduce the bug since it partially happens at random - I'm referring to the deletion part).

If you find that the bug report matches your problem too (I'm not 100% sure), could you please leave a comment in the KDE bugtracker (providing a link to this bug report); otherwise, could you please open a new bug report at the KDE bugtracker (<https://bugs.kde.org/>), filing it against the product "kmail2" and the version "4.7"? This way, the KMail developers will be notified of the bug and will fix it.

In any case, after you have completed the process, please click on the link "Also affects project" at the top of this bug report and write the URL of the bug in the KDE bugtracker there. This way, we can notice when the bug has been fixed by the KMail developers and release a new version of KMail in Ubuntu accordingly.

Thanks again for all the information!