Microsoft is deploying a better dashboard to have insight in mail flows.
This dashboard will be available worldwide by the end of May from the Security and Compliance center (https://protection.office.com).
Thanks to this dashboard you will have some insights for your mail flow, like:
To access this new mail flow dashboard, go to to your Security and Compliance portal (https://protection.office.com) and reach out the Mail flow\Dashboard blade
Then you can navigate the dashboard
If you click on one of the active content you can have more readable details (like for the Top Senders and Recipients)
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