When using the Breeze Dark theme in Plasma 5.2 Kmail fails to display most mails. I'm attaching the mail source and a Screenshot. Reproducible: Always
Created attachment 91332 [details] Screnshot of Kmail failing to render the mail message
Created attachment 91333 [details] Message Source
please explain what is not ok for you. Thanks
I believe the problem is that the email body appears grey (from the color palette 'text' color), on a white background (which is not the pallette expected dark background).
Cannot reproduce anymore. I guess this is fixed. Closing.