|"Bcc" allows you to send an e-mail without showing everyone the e-mail address of the recipients. It also is the polite thing to do. This way you're not inadvertently sharing a person's e-mail with a group of people they may not know, by including them in a mass email. You can also use the "Bcc" field to quietly notify a third party that a message has been sent.|
Use of "Bcc" for long lists of addresses is important for two reasons:
It protects the privacy of those to whom you send a message, and
It makes forwarded e-mail less confusing to read
When using "Bcc" add your own e-mail in the To: field to ensure yours is the only address shown.