The "BCC" field in e-mail programs allows you to copy your message to another individual without the recipients in the "To" and "CC" fields knowing. If you were included in the BCC field of a message, don't hang the sender out to dry by replying to everyone who received the message, Dave Johnson writes. Also, as a sender, be sure to use the BCC field responsibly. "My rule of thumb: Never BCC someone on a thread with bad news, only good news," he writes.
The right way to use e-mail's BCC field