@SukantK9 To enable the Message Stream feature in Pega CDH 24.2, log in to your Pega CDH environment with administrative access and go to Application > Tools > Feature Management. Search for "Message Stream" and click Enable to activate it. Once enabled, go to Channels > Email and configure the necessary settings like sender profiles and email templates. Ensure the email delivery settings are correctly configured for your campaigns. After setup, create a test email campaign to confirm the feature is working properly by checking if emails are sent and delivered successfully. This feature helps you manage, send, and monitor emails directly within Pega CDH without needing an external email service provider, improving efficiency for marketing teams. If you face issues or need further customization, refer to the official Pega documentation or contact Pega support for assistance