How to Use Blind Copy in Outlook So Recipients Don't See Each Other's Addresses

Blind copy lets you send one email to multiple people without showing them who else received it

In Outlook, blind copy (BCC) is a field that works like the regular "To" field, except recipients in the BCC line cannot see each other's email addresses — and they cannot see who else is on the BCC line. When you send an email with BCC recipients, each person receives the message but sees only their own name in the recipient field, not the full list.

This matters for privacy and for spotting scams. If someone forwards you an email with dozens of addresses visible in the "To" or "Cc" field, those addresses are now exposed to everyone on that chain. Using BCC protects people's contact information. It also helps you notice when a sender is being careless with your address — a red flag for phishing or spam.

Key Takeaways

• BCC recipients receive the email but cannot see other BCC recipients or their addresses.
• The BCC field is hidden by default in Outlook; you must click "Bcc" to make it appear.
• Use BCC when sending to mailing lists, group announcements, or anyone whose address should stay private.
• If you receive an email with your address exposed in a long "To" list, that sender did not use BCC and may not be handling addresses carefully.

How to show the BCC field in Outlook on the web

Open Outlook in your web browser and click "New message" or reply to an existing email. In the compose window, you will see "To" and "Cc" fields at the top. Below the "Cc" field, click the text that says "Bcc" — it appears as a small link or button. The BCC field will now appear between "Cc" and the message body.

Type the email addresses of people you want to blind copy into that field, separated by semicolons or commas. They will receive the email without seeing each other's addresses or knowing they are on a BCC line.

How to show the BCC field in Outlook desktop app

Open Outlook on your computer and start a new message or reply. Look at the top of the compose window. If you do not see a "Bcc" button or field, click the "Options" tab (in newer versions) or look for a button labeled "Bcc" in the ribbon. Click it, and the BCC field will appear below the "Cc" field.

In older versions of Outlook, you may need to go to the "View" menu and select "Show Bcc Field" or similar wording. Once the field is visible, type the addresses you want to blind copy, separated by semicolons.

When to use BCC instead of To or Cc

Use BCC when you are sending the same message to a group of people who do not know each other or who should not see each other's contact information. Common examples include sending a newsletter to subscribers, notifying a group about an event, or reaching out to multiple job candidates. BCC keeps addresses private and prevents people from accidentally hitting "Reply All" and flooding everyone with responses.

Use "To" for people who are directly involved in the conversation and need to know who else is receiving the message. Use "Cc" (regular copy) when someone needs to see the message and know who else is involved, but they are not the main recipient. Reserve BCC for situations where privacy matters more than transparency about the recipient list.

Why BCC matters for spotting scams and careless senders

Legitimate organizations that send bulk emails — newsletters, announcements, password resets — almost always use BCC. If you receive an email with your address visible alongside dozens of others in the "To" field, that sender either does not know how to use email properly or does not care about your privacy. Either way, it is a warning sign.

Scammers often send phishing emails to large lists without using BCC, partly because they are using automated tools that do not handle it well, and partly because they do not care if the list is exposed. If you see your address mixed in with a long list of strangers, think twice before clicking links or downloading attachments, even if the sender name looks familiar.

What happens if you accidentally put someone in To instead of BCC

If you realize before sending that you put someone in the "To" field who should have been in BCC, straightforward cut their address from the "To" field and paste it into the BCC field. You can move addresses between fields the same way you would move text anywhere else.

If you have already sent the email, you cannot unsend it or hide the recipient list from people who already received it. In Outlook on the web, there is an "Undo Send" feature that works for a few seconds after you hit send — if you catch the mistake when ready, click "Undo" in the notification that appears at the bottom of the screen. In the Outlook desktop app, the undo window is also a few seconds, so you have to be quick.

BCC and reply-all: why BCC recipients should not use reply all

When someone receives an email where they are in the BCC field, they see only their own address in the recipient list. If they click "Reply All," the reply goes only to the sender and anyone in the "To" and "Cc" fields — not to other BCC recipients. This is by design and is one reason BCC is useful for large groups: it prevents accidental reply-all storms.

However, if a BCC recipient forwards the email to someone else, they can expose the original sender's message and the full recipient list to new people. BCC protects privacy during the initial send, but it does not prevent someone from sharing the email later.

Frequently Asked Questions

Can BCC recipients see each other?

No. BCC recipients cannot see other BCC recipients, their addresses, or even that a BCC field was used. Each BCC recipient sees only their own address in the recipient line.

What is the difference between Cc and BCC?

Cc (carbon copy) recipients can see all other recipients and know they are on the email. BCC (blind carbon copy) recipients cannot see other BCC recipients or their addresses. Use Cc when transparency matters; use BCC when privacy matters.

If I receive an email with lots of addresses showing, should I be worried?

Not necessarily worried, but cautious. It suggests the sender does not use BCC or does not know how. Be extra careful before clicking links or downloading attachments from that email, especially if the sender is unfamiliar or the message seems unusual.

Can I undo an email I sent with the wrong BCC addresses?

Only if you catch it within a few seconds. Both Outlook on the web and the desktop app have an "Undo Send" feature that appears briefly after you hit send. After that window closes, the email is gone and cannot be recalled.

Does BCC work the same way in all email providers?

Yes. BCC works the same in Gmail, Yahoo Mail, Outlook, and other major email providers. The field may be in a slightly different location, but the function is identical: recipients in BCC cannot see each other.