A：I'll be happy to try to answer your question, but I don't have a lot of time. I have a meeting in a few minutes.
A：Can you explain what you mean?
C：今天早上，我收到通知，说要开会，让大家回个email, 看能不能参加。我就"reply to all"说能来。
A：They have a very good point. When you get a message by e-mail to announce a meeting, you should not reply to everyone else who received the e-mail. Your response should go only to the sender.
A：Your reaction may have to do with your laid-back personality.
A：Laid-back means easy-going. No one wants to get unnecessary e-mail like the one you sent. You are not being thoughtful of other people's time.
A：In the future think before you reply to all. Oh, I'm sorry, Chen Hao, but I've really got to go.
A：Sure. I call you after the meeting.
C：Good afternoon. Accounting department. This is Chen Hao.
A：Hi CH. I am out of my meeting and wanted to call you before I go home.
A：You are not alone. Lots of people have the same issue. "CC" means "courtesy copy." You use "CC" whenever you need to inform someone of what is being done but they are not responsible for doing it.
A：When your colleague needs to be sure that you know your duties, he sends the e-mail to you. However he sends a copy to your boss so he knows what is going on. You can see that your boss got the e-mail, too.
A："Bcc" stands for "blind "courtesy copy." It's used when you don't want the receiver to know who else got the message.
A：That's right. The only time I find "Bcc" acceptable is when you don't want to reveal all the e-mail addresses of the people you are mailing to for security purposes.