Whether it is possible to configure Kerio so?

Question

Kerio

It is necessary to close the possibility of downloading files "from" and "to" the Internet, leaving only the exchange of files with the outside world through work mail. Example: The user has skype and can send messages but cannot download or send any files. Can this be done in Kerio Control?
The postal service is located in the open spaces of Yandex (everyone uses it through a browser). I understand that it is impossible to cover the download of files through personal mail on Yandex, and at the same time leave it on the working domain?