What do Cc and Bcc mean in email? A practical guide

Cc means carbon copy. Bcc means blind carbon copy. Both send someone a copy of your email; the key difference is whether their address is visible to the other recipients. To is for the primary recipients. The email standard defines all three fields.

A useful habit: put the person responsible for the next step in To, keep observers in Cc, and use Bcc when the recipient list should stay hidden. Then state the request in the message itself. A field cannot explain who needs to do what.

To, Cc, and Bcc at a glance

These visibility rules are described in Gmail’s recipient guidance. In Gmail, Bcc recipients can see the To and Cc addresses, but not the other Bcc addresses. Read Gmail’s explanation.

When should you use Cc?

Use Cc when someone needs context but does not own the request. Imagine you are asking a designer to approve a new landing page and keeping a project manager informed. Put the designer in To and the project manager in Cc.

To: alex@example.com
Cc: sam@example.com
Subject: Approval needed: landing page copy

Alex, could you approve the headline by Thursday?
Sam, copying you for visibility; no action needed.

This is an illustrative example, not a real email. The useful part is the final sentence: it makes the expectation explicit instead of hoping that everyone interprets Cc the same way.

If both people need to make a decision, put both in To and name each person’s task. If a colleague only needs the final outcome, consider sending them a short update afterward. A smaller audience makes the request easier to follow.

When should you use Bcc?

Bcc suits a one-way update to people who do not need to see one another’s addresses. For example, a workshop organiser could send arrival instructions to attendees without turning the email into a shared address book.

Bcc hides the recipient’s name from the other recipients of the original message. The sender can still check the Bcc list in Sent Items in classic Outlook. Microsoft explains Bcc visibility.

For that workshop example, a practical arrangement is your own address in To and attendee addresses in Bcc. Say that replies should come directly to you. For a discussion where attendees need to collaborate, choose a shared conversation format instead.

What happens when someone replies?

Reply normally addresses the sender. Reply All includes the sender and the visible To/Cc recipients. You can edit that list before sending, so always check the actual addresses in the reply. Microsoft’s reply guide shows the difference.

A Bcc recipient is not automatically carried into the replies sent by other recipients. If you need someone to follow an ongoing conversation, a blind copy of the first email is an unreliable way to include them. Gmail documents this reply behaviour.

Google announced a Gmail warning for this situation in July 2026 and updated its wording in September. It appears when someone tries Reply All without being listed in To or Cc, including some forwarded and delegated messages. Google says it is available for personal and Workspace accounts. Read the Gmail announcement.

How to add Cc and Bcc

The controls vary by app and version. These steps follow the providers’ current documentation, checked on 13 October 2026.

Gmail on a computer

Open Compose, add your primary recipient in To, and use the Cc or Bcc fields for additional recipients. Complete the subject and message, then inspect all addresses before sending. Gmail’s sending instructions.

Outlook for Windows

In new Outlook, open a message and choose Options → Show fields → Show Bcc. In classic Outlook, use Options → Bcc when composing in a separate window, or select Bcc on the ribbon when composing in the Reading Pane. Instructions for both Outlook versions.

Apple Mail on iPhone

Start a message in Mail, enter the main recipient in To, then tap Cc/Bcc to expand the additional fields. Add an address in Cc for a visible copy or Bcc for a hidden copy. Apple’s Mail instructions.

A quick check before you send

• Ownership: is the person who needs to act in To, and does the body explain the next step?
• Audience: does everyone included need this message, or just the eventual outcome?
• Privacy: are unrelated recipients in Bcc when their addresses should stay private?
• Reply: if you are responding, have you checked the recipient list rather than relying on the button’s name?

For a large mailing, check your provider’s sending limits. Bcc recipients still count toward recipient limits; moving addresses into Bcc does not bypass them. Microsoft explains recipient limits.

Common questions about Cc and Bcc

Choose the audience first, then the field. That small pause helps you send a clearer request and avoids sharing addresses by accident.

For help with the message itself, see our guide to writing a formal email.