Known as Carbon Copy or Courtesy Copy. This field is exactly like the To: field, except it isn’t required to be filled.
CC: acts more like a differentiator for contacts who may want a copy of the email but are not required to participate in the conversation, i.e. management. It basically says, ‘this email is directed to you but these people are reading it too‘.
Those who would appear in the CC: field should have filters applied.”
Let’s get right into it shall we.
You basically are exposing the email address of your colleagues to potential spammers. I have received many emails from people that I have never met or given my email address to.