[Email security] Add brief overview (#26429)

* [Email security] Add brief overview

* Add preposition

Author: Maddy-Cloudflare

src/content/docs/cloudflare-one/email-security/setup/post-delivery-deployment/bcc-journaling/bcc-setup/gmail-bcc-setup/add-bcc-rules.mdx

@@ -5,6 +5,12 @@ sidebar:
   order: 4
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+This page will show you how to add BCC rules in the Google Admin Console.
+
+BCC stands for Blind Carbon Copy. A BCC rule is a Google Workspace feature that allows you to create a secure copy of all selected outbound and inbound emails. When you allow Email security to receive a copy of your emails, Cloudflare can perform post-delivery analysis to protect your email inbox.
+
+To add BCC rules:
+
 1. Log in to the [Google Admin Console](https://admin.google.com/).
 2. On the sidebar, go to **Apps** > **Google Workspace** > **Gmail** > **Compliance**.
 3. Go to **Content Compliance** > Select **Edit**.
@@ -28,4 +34,4 @@ sidebar:
        - Under **Headers**, select **Add X-Gm-Spam and X-Gm-Phishy headers**.
        - Select **SAVE**.
 8. In **Account types to affect**, select **Users** and **Groups**.
-9. Select **SAVE**.
+9. Select **SAVE**.