On latest Kmail, filters work correctly when a new email arrives in my inbox, the correct action is applied. But if I open Kmail and emails are already in my inbox, filters do nothing. If I right click the folder and select "Apply all filters to this folder", nothing happens. It used to work before.
Same behaviour here, my spam filter action is a shellscript runing crm114, adding some logging to it shows that the filter is run, the mail is marked, but kmail is not reading back the output of the filter. same for both imap and pop. distro: ubuntu 17.10 Kmail: 5.5.3
For some reason, I am not affected by this bug anymore (but maybe it'll come back some time later)...