In Outlook Express, there is an option for CCing
(carbon copying) and BCCing (blind carbon copying) intended recipients. Just click the TO
button next to the address field and a new window will pop up exposing the BCC box at the
bottom. Select your desired address and click the BCC button, then click OK.
When a sender enters addresses only into the BCC
field, and sends with an empty TO field, those messages are received as "undisclosed
recipient."
The use of the BCC field is actually a very
practical one. How many times have your received forwards only to find that your email
address was among many listed in the TO or CC line? Privacy is a big issue these days
among computer users and having your address displayed in that manner only gives multiple
unknown recipients access to your address and open you up for a mailbox jammed full of
spam!