How to Add a Blind BCC in Outlook (All Versions)

When you send an email to multiple people, every recipient can see the full To and CC fields by default. That means everyone knows who else got the message. BCC — Blind Carbon Copy — solves that by hiding certain recipients from everyone else on the email. Here's exactly how it works in Outlook, and what you need to know before using it.

What BCC Actually Does

When you add someone to the BCC field, they receive a full copy of the email, but their address is invisible to everyone in the To and CC fields. Importantly, BCC recipients also can't see each other — if you BCC five people, none of them know the others received it.

A few mechanics worth understanding:

• BCC recipients cannot reply-all to the group. If they hit Reply All, their reply goes only to you (the sender).
• The original BCC address is stripped from the message headers that other recipients see.
• BCC recipients do see the To and CC addresses — they know who else received the email openly.

Common uses include sending newsletters without exposing a contact list, protecting recipient privacy in group announcements, or quietly looping in a manager or colleague on a sensitive thread.

How to Add BCC in Outlook on Desktop (Windows & Mac)

The BCC field isn't visible by default when you open a new message window in Outlook. You have to enable it manually — but you only need to do it once per compose session.

Step-by-step:

1. Open a New Email in Outlook.
2. Go to the Options tab in the ribbon at the top of the compose window.
3. Click BCC in the "Show Fields" group.
4. The BCC field will now appear below the CC field in your message.
5. Type recipient addresses into the BCC field as you normally would.

📌 Once you enable the BCC field in a compose window, Outlook remembers the setting and shows it in all future new messages during that session — and often persists across sessions depending on your version.

On Outlook for Mac, the process is slightly different:

1. Open a New Message.
2. Click Options in the toolbar.
3. Select BCC Field to toggle it on.

The field then appears in the message header area, and you can add addresses directly.

How to Add BCC in Outlook on the Web (OWA)

If you use Outlook on the Web (formerly OWA, or accessed via outlook.com or your organization's Microsoft 365 portal), BCC is also hidden by default.

To show it:

1. Click New Message to open a compose window.
2. In the To field area, look for the label BCC — in newer versions of Outlook Web, it typically appears as a small link or option on the right side of the To field line.
3. Click BCC to expand the field.
4. Add your hidden recipients.

The interface varies slightly depending on whether you're on a personal Microsoft account, a Microsoft 365 business account, or a legacy Exchange-connected portal. The core behavior is identical across all of them.

How to Add BCC in the Outlook Mobile App 📱

On the Outlook mobile app (iOS and Android), the BCC field is tucked away but accessible:

1. Tap the compose icon to start a new email.
2. Tap on the To field — this usually expands the header area.
3. Look for a BCC label or arrow that appears alongside the CC option.
4. Tap BCC and type in the address(es) you want to hide.

Depending on your app version and platform, the BCC option may appear automatically when you tap the To field, or it may require tapping a small expand icon (often a downward arrow or a "+" symbol).

Key Variables That Affect Your Experience

Not every Outlook user is working with the same setup, and that affects how BCC behaves in practice:

BCC vs. CC — A Quick Distinction

What Changes Depending on Your Situation

Using BCC correctly depends more on context than most people realize. In a corporate Microsoft 365 environment managed by IT, your organization may have message recall policies, archiving rules, or DLP (Data Loss Prevention) controls that interact with BCC in ways that aren't obvious from the front end.

In a personal or small-business Outlook setup connected via IMAP or POP3, BCC behaves in a more straightforward way — but the configuration of your outgoing mail server can still influence header handling.

For bulk communications, some senders discover that heavy BCC use triggers spam filters on the receiving end, since sending one email to dozens of BCC'd addresses is a pattern associated with mass mail. Whether that's a concern depends entirely on how many recipients you're adding and what kind of content you're sending.

The mechanics of adding BCC in Outlook are consistent. What varies — and what determines whether BCC is the right tool for your situation — is the scale, the relationship context, the account environment, and what you're actually trying to accomplish with the message.