Is it possible to get the amount of emails sent and received in workspace by Google API?

I need to get the amount of emails sent and received in a Google Workspace.

Basically, I want to know if it is possible to get the data of this report by some Google API. I get this print directly from Google Admin.

I tried using Gmail API.

const { google } = require('googleapis')
const oAuth2Client = require('./oauth.js')
const gmail = google.gmail({
  version: 'v1',
  auth: oAuth2Client
});

await gmail.users.messages.list({ userId: 'me' }) // success
await gmail.users.messages.list({ userId: 'othermail@domain.com' }) // permission error

But I can only get the emails from the authenticated account. And I need from all accounts in domain.

Solution

To list all messages in every account, you will need to use domain-wide delegation to impersonate the account.

However, it's easier and more performant to find the closest property in the Reports API that fits what you need, like num_emails_exchanged.