Version: 1.9.1 (using KDE 3.5.0, Debian Package 4:3.5.0-3 (testing/unstable)) Compiler: Target: i486-linux-gnu OS: Linux (i686) release 2.6.15-1-686 When filtering mails, if there is a crypted mail, kmail stops filtering and asks for password to open that crypted mail. This is inconvient as I get about 100 mails a day, 95% spam, and the interaction with IMAP server is slow, as well filtering, so filtering operation takes about 5-15 minutes. So the filtering is good to leave to background, but crypted mails breaks this functionality. For filtering there is no need for the information in crypted mail body itself.
Please let me know what kind of filters you use. In Kmail 1.9.6, there I've set up a single filter with (size >= 0) which will copy the message to another folder. If I apply the filter on a selection of messages containing an encrypted message, the messages will be copied as expected and I am not asked for the passphrase.
Thank you for taking the time to file a bug report. KMail2 was released in 2011, and the entire code base went through significant changes. We are currently in the process of porting to Qt5 and KF5. It is unlikely that these bugs are still valid in KMail2. We welcome you to try out KMail 2 with the KDE 4.14 release and give your feedback.