Turn on your read receipts to make sure your emails are getting seen
You must have a G Suite Business account to request read receipts and the feature must be enabled by your G Suite Administrator for you to use this feature.
Here’s how to request a read receipt:
Compose (or Reply to) a message
Click More options in the lower-right corner of the compose window
Click Request read receipt from the drop down
Send your message
A receipt requests will be sent to every recipient in the To: and Cc: fields. It does not send requests to recipients in the Bcc: field.