[Email Security] Add Configure policy step (cloudflare#25146)

Author: Maddy-Cloudflare

src/content/docs/cloudflare-one/email-security/setup/post-delivery-deployment/api/m365-api.mdx

@@ -37,12 +37,13 @@ To use Email Security, you will need to have:
 
 To enable Microsoft integration:
 
-1. **Name integration**: Add your integration name, then select **Continue**.
-2. **Authorize integration**:
+1. **Configure policy**: Choose how [CASB](/cloudflare-one/applications/casb/) interacts with your data. Select **Read-only mode** or **Read-Write mode**. It is recommended that you choose **Read-Write mode**.
+2. **Name integration**: Add your integration name, then select **Continue**.
+3. **Authorize integration**:
    - Select **Authorize**. Selecting **Authorize** will take you to the Microsoft Sign in page where you will have to enter your email address.
    - Once you enter your email address, select **Next**.
    - After selecting **Next**, the system will show a dialog box with a list of requested permissions. Select **Accept** to authorize Email Security. Upon authorization, you will be redirected to a page where you can review details and enroll integration.
-3. **Review details**: Review your integration details, then:
+4. **Review details**: Review your integration details, then:
    - Select **Complete Email Security set up** where you will be able to connect your domains and configure auto-moves.
    - Select **Continue to Email Security**.