How To Activate Read Receipt In Gmails In Compose Dialog Box?

If the option is not available but you still want to ask for a read receipt, you can do so by using an Email client like Thunderbird or Outlook. Or you can use Boomerang

1. Set up read receipts
2. Sign in to your Google Admin console.Sign in using your administrator account (does not end in @gmail.com).
3. From the Admin console dashboard, go to AppsG SuiteGmailAdvanced settings.Tip: To see Advanced settings, scroll to the bottom of the Gmail page.
4. If you've created suborganizations in your Admin console, under Organizations at the left, select the organizational unit you want to configure settings for. The Organizations section isn't available if no suborganizations have been created. For details, see Configure advanced settings for Gmail.
5. In the Email read receipts section, specify the senders your users can return receipts to:
   • Do not allow read receipts to be sent: Disables requesting and returning read receipts.
   • Allow email read receipts to be sent to all addresses in my organization as well as the following email addresses: Restricts responses to addresses in your domains and any external addresses that you specify. Separate external email addresses with commas. You can enter up to 100 addresses; each address can have up to 256 characters. If you don't include any addresses, users will only be able to return receipts to other users in your domains.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.
6. At the bottom, click Save.

https://support.google.com/a/answer/1383374?hl=en

Thanks

1. On your computer, open Gmail and click Compose.
2. In the To and Cc fields, enter recipients as you normally would, and write your subject and message.Read receipts aren't returned for messages you send to a group mailing list or alias.
3. Click More options .
4. Click Request read receipt.You won't see this option with your current . Read receipts are available only if you use Gmail with your work or school.
5. Send your message.You can see your read receipt when you open Gmail. The person you sent the message to may have to approve the read receipt before you're notified.