With the advent of akonadi Kmail has become unusable. I have not found a way to turn off the warning messages that freeze up kmail. They have to do with other packages such as Mysql which I don't even use. Even when kmail works the akonadi load cycle slows things down. So I am looking for a decent gui mail client replacement.
I use Slackware 13.1. My only alternative is to boot 13.0 just for email purposes.
Kmail used to be a very useful program.
Many applications use mysql or the lite version. Akonadi should have little impact on your system unless it is very old, but if you look at System Settings -> Desktop Search you may find that Strigi is running. That does have an impact, at least when doing the initial scan, which can take some considerable time. You can either disable Strigi or pause it, allowing it to run overnight or when your system is not busy. For the sql errors, try reading the UserBase pages, starting with Akonadi and continuing onto the linked pages.
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This is not the place for such messages. forum.kde.org have a Discussions & Opinions section. Take your concerns there and maybe someone will answer you.
You said you were experiencing heavy activity that slowed everything and I pointed to Strigi as a likely candidate. At no point did I suggest that it was making your kmail unusable. This appears to be some problem with your setup and this is not the place to get help with the problem. There are mailing lists and forums for that. My reply was an attempt to help, despite the fact that this is an inappropriate place for the discussion.
Let me mention that the problems I cite which make Kmail unusable were encountered on fresh installs of Slackware 13.1 and 13.37 on freshly formatted partitions. All software was installed. If the major program Kmail is unusable under such circumstances I suggest that advice to do something with MySQL is misplaced. Slackware and KDE4 are not new products. They are supposed to work out of the box. They should not be dependent on user action with respect to the toally unrelated program MySQL.
If there is another place I can reach the KDE developers please give me a pointer.
John Culleton (Slackware user since the days of a tray full of floppies).