Is there a way of having a business rule which does not "Notify contact by email" based on certain criteria. 

My reason for asking is that I schedule new monthly tickets for certain accounts for contracted work - so we can monitor internally how many hours are being worked on for these requests. As these are internal but for reporting  we need them to be shown against the account  -  but we do not need the customer to be informed of these requests being generated or closed. 

An assistance would be greatly appreciated,

Many thanks,