How to Add a Blind Copy (BCC) in Outlook

Sending an email to multiple people without exposing everyone's address to the entire list is one of the most practical — and most overlooked — email habits. BCC (Blind Carbon Copy) lets you include recipients silently, so they receive the message but their address stays invisible to other recipients. Here's exactly how it works in Outlook, and what you should know before using it.

What BCC Actually Does

When you add someone to the To or CC field, every recipient can see those addresses. BCC works differently: recipients in the BCC field receive a full copy of the email, but their address is hidden from everyone else — including other BCC recipients.

A few key behaviors worth knowing:

• BCC recipients cannot reply-all to the thread in a way that exposes them (they can reply, but only back to the original sender)
• The sender sees BCC recipients in their Sent folder
• BCC recipients do not see each other's addresses
• Once the email is sent, BCC recipients are effectively removed from the conversation — follow-up replies won't reach them automatically

This makes BCC useful for mass announcements, protecting contact lists, and discretely keeping someone in the loop.

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

The BCC field is hidden by default in Outlook's compose window. You have to enable it manually — but only once per session or permanently, depending on your version.

Step-by-step (Outlook for Windows):

1. Open a New Email window
2. Click the Options tab in the ribbon at the top
3. Select BCC in the "Show Fields" group — this adds the BCC field to your current message
4. Type recipient addresses into the BCC field just as you would in the To field

💡 Once you enable BCC this way, it typically stays visible for all new emails in that session. If it disappears after restarting Outlook, repeat the process — some versions don't persist the setting automatically.

On Outlook for Mac:

1. Open a New Message
2. Go to Options in the menu bar
3. Click BCC Field to toggle it on
4. Add your recipients to the BCC line

How to Add BCC in Outlook on the Web (Outlook.com / Microsoft 365)

The web version of Outlook handles BCC slightly differently:

1. Click New Mail to open the compose pane
2. In the To field area, look for a BCC link — it usually appears to the right of the To field or as a dropdown option
3. Click it to reveal the BCC field
4. Add your recipients

In Microsoft 365 (work/school accounts) accessed via browser, the same approach applies, though the interface may look slightly different depending on whether your organization uses the classic or updated Outlook experience.

How to Add BCC in the Outlook Mobile App

On both iOS and Android, the Outlook mobile app tucks BCC behind an extra tap:

1. Tap the compose (pencil) icon to start a new email
2. Tap in the To field — a small arrow or chevron should appear nearby
3. Tap that arrow to expand the full recipient options, revealing CC and BCC fields
4. Tap BCC and add your recipients

The exact position of the expand arrow varies slightly between app versions and operating systems, but it's always near the recipient fields.

BCC vs. CC — When Each Makes Sense

A Note on BCC and Email Deliverability

If you're using BCC to send bulk emails through Outlook, be aware that some spam filters flag messages where the To field contains only your own address and all real recipients are hidden in BCC. This doesn't affect typical business use cases, but it's a variable worth knowing if you notice delivery issues at scale.

For high-volume sending, dedicated email platforms handle this differently than standard Outlook accounts — a distinction that matters depending on your sending volume and infrastructure.

Variables That Affect Your Experience

How smoothly BCC works in your workflow depends on a few factors:

• Outlook version — Classic Outlook, New Outlook (Windows), Outlook for Mac, and the web app each have slightly different interface layouts
• Account type — Personal Microsoft accounts, Microsoft 365 work accounts, and accounts connecting via IMAP/POP3 may behave differently in edge cases
• Mobile OS version — App updates occasionally shift where UI elements appear
• Organization settings — Some enterprise configurations restrict or log BCC usage for compliance purposes

The steps above cover the most common setups, but if your Outlook interface looks different from what's described, your version or account configuration is likely the reason. Knowing which version you're running — and whether it's managed by an employer — is the starting point for troubleshooting any gaps between these instructions and what you're actually seeing.