What is BCC (Blind Carbon Copy) in email?

BCC stands for Blind Carbon Copy. It's a field in your email that lets you send a message to someone without the other recipients knowing they're included. The main recipient (in the To field) and anyone CC'd won't see the BCC'd addresses at all.

Back when offices ran on paper and typewriters, secretaries would slip an extra carbon copy to someone quietly. The official recipient never knew that copy existed. BCC does the same thing digitally.

When you BCC someone, they get the full email just like everyone else. They can read it, see who's in the To and CC fields, and even reply (though that reply will expose them to the original sender). What they can't do is see the other BCC'd addresses. Every BCC recipient thinks they're the only hidden one.

Most people use BCC in two situations. First, when sending to a group of people who don't know each other and shouldn't see each other's email addresses (like a client list or event attendees). Second, when quietly looping someone into a conversation without the main recipient knowing (like copying your manager on a tricky customer exchange).

For email campaigns and newsletters, though, BCC is the wrong tool. Mailchimp, Brevo, and other ESPs exist specifically because BCC doesn't scale. If you BCC 500 people on one email, mailbox providers see that as a single message going to 500 addresses from your personal account. That looks like spam, and your domain reputation takes the hit. Plus, you get no unsubscribe mechanism, no analytics, and no way to track who opened what.

BCC also has a privacy trap. If a BCC'd recipient hits Reply All, their response goes to everyone in the To and CC fields, and now everyone knows they were secretly included. Awkward.

Use BCC for small, one-off group emails where privacy matters. Use an ESP for anything that looks like a campaign. And if you're not sure when to use CC vs. BCC, that's question 001.004.007.