How to disable Google's akonadi message

[Andreas Jung]

Hello!

Since my update to OpenSUSE 42.3, whenever logging into KDE, a message box 
appears that wants me to sign in to continue to "Akonadi Resources for Google 
Services".

But I do not want Google to access any information stored in my Korganizer. I 
only want the plain imap email functionality, no special Google functions.

So how can I disable this message?

Best Regards,
Andreas.