Using "BCC" (blind carbon copy) is advisable whenever you want to show your manager how you are handling a difficult coworker situation--to protect yourself against recriminations later.

Question

Quizplus · Accepted Answer

BCC should not be used in this situation as it is not transparent and could be seen as unethical or sneaky. It is better to involve your manager directly and openly in addressing the difficult coworker situation.

Using "BCC" (Blind Carbon Copy) Is Advisable Whenever You Want