I don't use kmail on my Ubuntu anymore. I use Thunderbird now.
still I have this 1.6GB large file
~/.local/share/akonadi/file_db_data
I only guess, it is so large, cause my IMAP folder is about that size and It was created, when I tried out kmail.
Is that file needed for anything else than kmail?
If I would remove the whole akonadi-server with
apt-get remove --purge kmail akonadi-server
would that delete anything I could still use although I don't use KDE anymore?
For example, I still use krusader and some passwords stored there seem to come from the kde-wallet.