In https://bugzilla.mozilla.org/show_bug.cgi?id=184490#c50 there is a workaround: "configure your IMAP folders for offline use".
-- After-the-fact Filters on custom header won't match for IMAP messages https://bugs.launchpad.net/bugs/119899 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
