![]() ![]() To check a particular email, we can run something like the following cmdlet and look at the SourceContext field: Get-TransportService | Get-MessageTrackingLog -ResultSize Unlimited -Start -EventID SUBMIT -Sender -MessageSubject Test | Select SourceContext Please note that this only applies to emails sent by internal users! There is no SUBMIT event when an external sender sends an email to an internal user, meaning there is no ClientType property for these emails. The important thing is to check this property for SUBMIT events, i.e., when the Mailbox Transport Submission service passes the email to the Transport service (in other words, when Exchange picks up the email from the mailbox's outbox folder and passes it on for delivery). Every email sent has a SourceContext property which contains, amongst other information, the ClientType used to send the email. The good news is that the Message Tracking Logs, as expected, records this information. The other I got a client asking me if there was a way to determine which email client (Outlook, OWA or ActiveSync) sent a particular email.
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