Version: 1.9.3 (using KDE KDE 3.5.3) Installed from: Gentoo Packages Compiler: GCC 3.4.6 OS: Linux I have put my spam into INBOX/spam folder. I am using cached imap. If I look through the spam folder and find a message which is not spam, I like the "Filter classify as NOT spam" button and it gets a check mark beside it. Then I move the spam to my INBOX. The next time KMail downloads my INBOX it puts that message back in the spam. The message should remain in my INBOX.
Still a problem? Probably kmail should not use the spam filter on messages marked as harmless.
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.