There must be some corruption to my message store (pop3) as kmail keeps crashing and hanging. I followed the following info to try and reset kmail: https://docs.kde.org/stable5/en/pim/kmail/clean-start-after-a-failed-migration.html but after point (3) all it did was clean up akonadi, all the messages are still in kmail, and it still crashes and/or hangs.
How do I also remove the messages for a fresh 'factory' start ? Is it enough to remove the folder holding them (~/.local/share/local-mail/) ?