Currently I have about 40 filters installed to shift incoming emails to a folder "unimportant mails". I imported the filters from kmail 1.13.5 (Debian 6.0) to my current kmail 4.1.4.1 (Debian 8.1), replacing the new config file "kmailrc" by the old one (is this "allowed" ?). One day all filters are running properly, the next day none of them is running and all emails appear in the inbox. Two days ago I changed one filter: The next email download was running properly, today no filter works. I observed this behaviour also with the old kmail 1.13.5. Almost all of the 40 filters look similar. Search a word or string "anywhere in header" and "match any of the following". Anybody has made similar experience ? Thanks for support.