I was using Kmail for awhile on Kubuntu 16.04, but had to stop using it due to a few things I didn't like so I switched to Thunderbird. Now that I don't want to use Kmail anymore I would also like to disable its notifications and stop it from running in the background.
Any easy way to do this without uninstalling? I say that because they may fix a few of the problems which would make me want to use it again.
Thanks
In Kmail go to Settings menu, click on Configure Kmail, click on the account you do not want to "run in the background", click the Modify button in the right panel and uncheck Enable interval mail checking.