How do I send a blind carbon copy (Bcc)?
Blind carbon copies are the same as carbon copies (Cc), except that addresses that receive Bcc's are not visible to the recipient. So, if you send a message to email@example.com, and Bcc firstname.lastname@example.org, both will receive your message, but to them it will appear as though you only sent the message to email@example.com.
To send a Bcc, just enter the email address in the Bcc box in your email program or Email on the Web. You can specify multiple addresses by separating them with commas.