I am using MailApp from Google Apps Script to send emails. When I send an email, I want to be able to track to see if the email was opened or not. This email account is a G Suite account and Email Read Receipts is set to "Allow email read receipts to be sent to any email address."
With MailApp, how do I specify to send the read receipt for the email?
I believe this is not possible with the MailApp class. The only option I thought it would be possible is by using the method sendEmail(recipient, subject, body, options). However, this method does not include any option to request for a read receipt as how you can see under the Advanced parameters explanation.
I also checked the GMAIL API service and there is no option to do this as well. The help center article here, explains this is available inside the gmail web UI and after several testing, I found out this is not possible via API.
In summary, by using apps script or the Gmail API is not possible to achieve this. The only thing that comes to my mind right now, is to implement a system in which you will include a unique image in the message and track for when the image is loaded. When the image is loaded, that means the message has been read. I have no idea how to implement such solution but I know is possible.
