some of our users created rules in GW-client like "if there is an incoming mail, forward it to my private adress xyz@gmx.net".

Is there any possibility to prevent for some clients this kind of rules from beeing executed?
Naturally I can exclude "xyz@gmx.net" from being processed but this would be "too much"...

Alternatively I searched for a possibility to restrict creating rules for those clients, but I didn't find where I can do this.