[1] "Bcc" can also stand for "blind courtesy copy" as a backronym of the original abbreviation.
[3] BCC in email is handled uniquely by the Simple Mail Transfer Protocol.
[4] There are a number of reasons for using this feature: In some cases, the use of blind carbon copy may be viewed as mildly unethical.
[6] A related risk is that by (unintentional) use of "reply to all" functionality by someone on Bcc, the original addressee is (inadvertently) made aware of this participation.
The recipient does not necessarily see the email address (and real name, if any) originally placed in the To: line.