Version:           1.11.2 (using 4.2.2 (KDE 4.2.2), Kubuntu packages)
Compiler:          cc
OS:                Linux (x86_64) release 2.6.28-11-generic

I have Kmail connecting to an Exchange server using Disconnected-IMAPS. I have some mail filters specified on the server side (e.g. all "bugzilla" mails go to a specific mail folder on the server). In addition, I have a filter rule as

"All incoming mail matching (headers, contain, x-bugzilla), pipe through external command /home/hash/work/scripts/journalize.pl" (the script is executable, takes no args).

The filter works correctly if I explicitly select certain message(s) and "Apply Filter" or "Apply All Filters", but does NOT work automatically when Kmail fetches emails from the server.

(this used to work with KDE 3.5.x Kmail, but broke after I upgraded to Ubuntu 9.04)