Hello,
On restart, Kontact is notifying with dialog that certificates from googleads and doubleclick are invalid and ask for permission to continue use them for the session or forever.
My question is what does Kontact has to do with googleads and doubleclick ? Why does it contacting them ?
Is there a way to change this behavior ?

OS: Kubuntu 14.04

Can you check in your options > Security whether "allow to load external references" is ticked?

Thank you for replying.
I have checked. The option is not ticked.

What accounts have you there? Are you also using akgregator for RSS feeds?

Hi,
No feeds. I wiped those some time ago.
I have only mail accounts. Mostly gmail. Gmail calendar is also connected