Learn how to hide the email address using the “Bcc” feature in the Apple Mail app to copy someone on an email you’re sending, but don’t want your recipient to see it.

When you compose an email and want to include another person on it, it’s easy to put their email address into the Copy (Cc) field. While this is handy when you want someone else to see the email and (hopefully) the responses, your recipient can also see that person’s email address. But what if you don’t want them to see the person you copy?
To hide an email address for someone you copy, you can “blind copy” them with the Bcc field in Mail. This may be old news to many of you out there, but it’s completely new if you don’t send emails often or have never used the feature. So, here’s how to hide an email address with Bcc in the Mail app on iOS and macOS.
On iPhone and iPad
1) Open the iOS Mail app and compose your email.
2) Tap the field marked Cc/Bcc at the top of the email, and it will expand into two parts: one for Cc (copy) and one for Bcc (blind copy).
3) In the Bcc field, enter the email address of the person you want to blind copy or tap the blue plus sign to select one of your contacts.
4) You can then tap to send your email as you normally would.
On Mac
1) Open the Mail app and create your email.
2) With the email open, click View > Bcc Address Field from the top menu bar.
3) You’ll now see the Bcc field (blind copy) in your email below the Cc field (copy). Either enter the email address of the person you want to add or click the plus sign to select one of your contacts. Finally, click to send your email when you finish.
You’ll notice that whenever you compose a new email moving forward, that Bcc field will display. To remove it, just follow Step 2 above and deselect it from the menu bar.
A note on responses
Keep in mind that the person you copy or blind copy on an email will only be copied on responses from your recipient if that recipient uses Reply All when they respond to you.
Also, check out: 40+ tips for the Mail app on your iPhone, iPad, and Mac