Cc stands for carbon copy and lists recipients who will receive a copy of the email and be visible to other recipients. Bcc stands for blind carbon copy and lists recipients who will receive a copy but be invisible to other recipients. The "To:" field must always contain at least one recipient for the email to send.

1. What do "Cc:" and "Bcc:" mean?
Last Updated: May 31, 2011
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Cc: stands for "carbon copy." Anyone listed in the Cc: field of a message receives a copy of that
message when you send it. All other recipients of that message can see that the person you
designated as a Cc: recipient received a copy of the message.
Bcc: stands for "blind carbon copy." This is similar to the Cc: feature, except that Bcc: recipients
are invisible to all the other recipients of the message (including other Bcc: recipients). For
example, if you send a message To: johndoe@domain.com and Bcc: janedoe@domain.com, then
johndoe sees himself as the message's only recipient. Janedoe, on the other hand, is "in the
know"—she can see that you sent the message To: johndoe, and that you blind-copied her. To
add an entry in the Bcc: field, click the "Show BCC" link to the right of the "To:" field.
Note: To send a message, you must always specify at least one recipient in the "To:" field. If you
don't, an error message appears when you attempt to send the message.
Note: Sending unsolicited mail or "spam" is a violation of the Yahoo! Mail Terms of Service and
won't be tolerated.