How to enable Read Receipts for Gmail from G Suite admin console

To Set up read receipts

    Sign in to your Google Admin console.

    Sign in using your administrator account 

    From the Admin console dashboard, go to Apps >> G Suite  >>  Gmail  >>  Advanced settings.

    In the Email read receipts section, specify the senders your users can return receipts to:

        If You Do not allow read receipts to be sent: Disables requesting and returning read receipts.

        Check the box Prompt the user for each read receipt request to ask users each time they read an email if they want to send a receipt. Uncheck the box to automatically send read receipts.

        Allow email read receipts to be sent to any email address: Allows read receipts to be requested and returned from email addresses inside and outside your organization. Users are always prompted to send a receipt.

    At the bottom, click Save.

It might take up to an hour for your changes to apply to individual user accounts.

Click here for more details