How to Send an Email to Undisclosed Recipients in Outlook

Keep Your Email Recipient List Secret

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When sending a regular email where all the addresses are in the same To or Cc field, every recipient sees every other address. This isn't the best approach if none of the recipients know each other or if you need to keep each identity unknown.

On top of that, these email addresses can quickly clutter up a message if there are more than just a few recipients. For example, an email sent to two people where the addresses are shown to each other is massively different than one went to dozens of addresses.

If you don't want to share each email address with all the recipients, you can build what we call an "Undisclosed Recipients" contact so that each recipient will see that address when they get an email. This does two things: shows every recipient that this email was not sent to just them and effectively hides all of the other addresses from each contact.

How to Create an "Undisclosed Recipients" Contact

  1. Open Address Book, located in the Find section of the Home tab.
  2. Navigate to the File > New Entry... menu item.
  3. Select New Contact from the "Select the entry type:" area.
  4. Click or tap OK to open a much larger screen where we'll enter the contact details.
  5. Enter Undisclosed Recipients next to the Full Name... text box.
  6. Enter your own email address next to the E-Mail... section.
  7. Click or tap Save & Close.

Note: If you already have an existing address book entry bearing your email address, make sure Add new contact or Add this as a new contact anyway is checked in the Duplicate Contact Detected dialog, and choose Update or OK.

How to Send an Email to "Undisclosed Recipients" in Outlook

After confirming that you've made a contact like described above, follow these steps:

  1. Start a new email message in Outlook.
  2. Next, to the To... button, enter Undisclosed Recipients so that it will auto-populate into the To field.
  3. Now use the Bcc... button to insert all the addresses you want to email. If you're typing them manually, be sure to separate them with semicolons.
    Note: If you don't see the Bcc... button, go to Options > Bcc to enable it.
  1. Finish composing the message and then send it.
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