Merge branch 'main' into v-kccross-x500

Author: Ruchika-mittal01

microsoft-365/admin/setup/add-domain.md

@@ -81,11 +81,16 @@ Check out this video and others on our [YouTube channel](https://go.microsoft.co
 
 ## Add a domain
 
+
+> [!IMPORTANT]
+> We recommend that your organization use a custom domain for sending, as it can enhance your email's appearance, improve its reputation and avoid limits designed to prevent misuse.
+
 To add a custom domain to Microsoft 365, select the tab based on your registrar's support for [**Domain Connect**](#domain-connect):
 
 - **Domain Connect** - Registrar supports Domain Connect and DNS records are added automatically.
 - **Manual** - Registrar doesn't support Domain Connect and DNS records need to be added manually.
 
+
 >[!NOTE]
 >
 > If your registrar supports **Domain Connect** but you prefer to manually verify domain ownership and manually add DNS records needed by Microsoft 365 services, select the **Manual** tab. If you decide to manually add DNS records, make sure you're familiar with how to properly add DNS records at your registrar. Incorrect DNS records can cause email and service outages.