I added an account to kmail, and it's been deleted for some time now.

Yet I still get a message window "confirm website access - Tine 2.0", it happens every time I boot and even at random times.

The message says:
You are about to log in to the site "..." with the username "$default$", but the website does not require authentication. This may be an attempt to trick you.
Is "..." the site you want to visit?.

When I click "do not ask again" and "no", I get the same message few hours later.

I have no active kmail account now except local folders and no online account in settings.

Is there any way I can stop getting this message?