Hillary Clinton

Much of the hacking of servers makes use of "human engineering" - that is exploiting human users who are the weak point of any email system. It might involve tricking someone into providing his/her pass code or secreting a virus which gives the hacker access to the system and spreads when a user opens a document.

Obviously if hundreds of people have access to a server, the chances that human engineering method will be successful increases tremendously. There are hundreds of people who can make a mistake. If only one person has access and a pass code, obviously the chances go down according.