https://bugs.kde.org/show_bug.cgi?id=297930
--- Comment #35 from Mark Fraser <mfraz74+...@gmail.com> --- After upgrading from Kubuntu 16.10 to 17.04 I have experienced this constantly. I've even tried redoing local-mail. Seems to mainly happen when there are duplicates in that folder. Sometimes I can fix it by restarting the local mailbox. Using KMail 5.4.3 -- You are receiving this mail because: You are watching all bug changes.