Export all external senders to excel, Office365 powershell

Have a customer hwo hope to export a list of all email adresses that have sendt them mail.
To clarify: all external senders that have sent a email to one of the internal users.

Found that I could use message tracking (GUI) to se all incoming mails on one and one user.
But hope to get a result, in excel, with just sender adresses, for alle internal adresses.
And just one listing pr sender, not one for every mail sent....

Is this possible?
Tore JacobsenSystem adminstratorAsked:
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Vasil Michev (MVP)Commented:
It's not that easy, especially if you have lots of users. Plus, MS stores data for certain amount of time only. Anyway, take a look at this example script and modify it to get the sender added as well: https://gallery.technet.microsoft.com:443/office/Office-365-Mail-Traffic-afa37da1

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