BCC is an email field used to send a copy of a message to recipients without their addresses being visible to others in the thread. It allows you to include tertiary recipients while keeping the identity and contact information of those individuals private.
What is BCC (Blind Carbon Copy)?
Historically, the term comes from paper correspondence where a typist would create copies without the names of other recipients visible on the top copy. In modern email, it serves as a privacy tool. While the "To" field identifies primary recipients and the "Cc" field identifies secondary recipients, the [Bcc field can also stand for "blind courtesy copy"] (IETF Request for Comments) as a backronym of the original abbreviation.
Why BCC matters
Using BCC provides several safety and organizational benefits for professional communication:
- Protects privacy: Recipients cannot see each other’s addresses, which is essential when emailing large groups who do not know one another.
- Prevents "Reply All" storms: It stops an accidental "Reply All" from reaching every person on a massive recipient list.
- Reduces security risks: [Bcc prevents the accumulation of email address blocks] (US-CERT) that are often harvested by malware or used for spam and chain letters.
- Maintains thread focus: You can move non-essential parties to BCC to remove them from future replies when their input is no longer needed.
How BCC works
BCC operates differently than other email fields at the technical level through the Simple Mail Transfer Protocol (SMTP).
- Direct Command: The SMTP server handles BCC recipients by using the [RCPT TO command to specify all recipients] (John C. Klensin).
- Envelope vs. Header: All recipients are included in the SMTP "envelope" for delivery, but the email "headers" (the parts you see in your inbox) only list the "To" and "Cc" addresses.
- Software Variation: Depending on the email client, a BCC recipient may see only their own address in the field or the addresses of the primary and secondary recipients, but never other BCC recipients.
Best practices
- Use for mass mailing lists: Protect the privacy of your subscribers or contacts by hiding their email addresses from the rest of the group.
- Move people to BCC for courtesy: When a colleague is no longer needed in a long conversation, move them to BCC and include a parenthetical note like "(Moving [Name] to BCC)" so they aren't bothered by future "Reply All" notifications.
- Address the email to yourself: When sending a message to a group via BCC, you can put your own address in the "To" field or leave it empty if your software allows.
- List names in the body: If it is important for BCC recipients to know who else is involved without sharing actual addresses, you can list their real names or a group identifier (e.g., "To the Remunerations Committee") in the body of the message.
Common mistakes
Mistake: A BCC recipient uses "Reply All." Fix: If a BCC recipient clicks "Reply All," the original sender and all visible recipients will see the reply, inadvertently revealing that the hidden recipient was included in the thread. If you are BCC'd, only reply to the sender unless instructed otherwise.
Mistake: Using BCC for unethical monitoring. Fix: Avoid using BCC to secretly include third parties in sensitive conversations where the "To" recipient expects a private interaction. Some view this as keeping the addressee under a false impression that communication is restricted to known parties.
Mistake: Sending to a long "To" list by accident. Fix: Always double-check your recipient fields before hitting send. Long lists of visible addresses are often considered bothersome and unprofessional.
BCC vs. Cc
| Feature | Cc (Carbon Copy) | BCC (Blind Carbon Copy) |
|---|---|---|
| Visibility | Visible to all recipients | Hidden from all other recipients |
| Primary Goal | Keeping people "in the loop" | Protecting privacy/preventing storms |
| Reply All Risk | Part of the reply chain | Can reveal themselves if they reply all |
| Social Norm | Standard professional courtesy | Used for large lists or secret copies |
FAQ
Can a BCC recipient see who else is on the email? A BCC recipient can see the "To" and "Cc" recipients. However, they cannot see any other people who were also placed in the BCC field. Each BCC recipient generally sees only their own address or a note like "undisclosed recipients."
How do I know if I was BCC’d on an email? Check your email headers or the recipient fields in your email client. If your address does not appear in the "To" or "Cc" fields, but you still received the message, you were likely included via BCC.
Is BCC ethical in professional settings? The corpus notes that BCC can be viewed as mildly unethical if used to hide the involvement of third parties in a conversation where the primary recipient believes the communication is limited to known participants. It is often better to forward an email separately than to BCC a third party secretly.
Does BCC prevent viruses? Yes, by hiding the list of recipients, BCC prevents the accumulation of email addresses that are often used by computer viruses and spam bots to spread malware through chain letters.
What is a backronym related to BCC? While the original term is Blind Carbon Copy, it is sometimes referred to as a "blind courtesy copy."
