Quickly filter your entire inbox with 3.1's most notable new feature.
Fedora 20, 64-bit, KMail version 4.13.3.
I have set up a filter in KMail that takes all messages whose subject contains "CentOS" and moves them to a specific folder. The filter is causing all kinds of problems.
I use Thunderbird, the version I currently run is 24.1.0.
I used to search for messages containing certain IDs or addresses with the Quick Filter, but since yesterday somehow it stopped working.