The findings from this recent study by KPMG are certainly interesting. It appears that copying senior members of an organisation can have a considerable impact on the email recipient. The study goes so far as to say that 'cc-ing' senior staff reduces trust and impacts staff morale and culture. 

Professor David De Cremer, KPMG Professor of Management Studies at the Judge Business School, concludes that 'cc-ing' senior employees in emails wastes time, reduces trust, and damages culture.

To 'cc' or not to 'cc'? That is the question.