Determine user who sent a shared mailbox message

[Victor Ivanidze]

To determine the user who sent a shared mailbox message you can use UniSent add-in.

[mwickens]

Thanks, our app needs to work on the Web, Mac and iOS as well as Windows, so unfortunately a COM add-in won't help.

[Victor Ivanidze]

Could you please describe in details what exactly does the add-in you have mentioned and why do you BCCing a modified message - it might be I'll suggest something.

[Henry_Lach]

Hi Victor, Emailgistics is a complete solution for helping teams manage shared mailboxes. What makes us unique is that we do this right inside of M365. One of the services we provide is tracking which users are replying to each of the messages in an M365 shared mailbox for both auditing and reporting purposes. We want to be able to do this exclusively using our Graph integration. That integration however, is limited by the capabilities exposed by Graph. Missing from Graph is any information on which user is performing an action on a message in a shared mailbox (this includes replying, deleting, etc.) We've created workarounds for this (our add-in in combination with BCC'ing) and our solution works very well, but it would be greatly simplified if Microsoft added the basic actor information to the Graph for shared mailbox messages. Hence this request. 

[piyushchugh]

This is such a simple requirement that we want to be able to know the actual user who sent an email through a shared mailbox, as a shared mailbox. Why do we need to find a workaround and/or use Powershell to get this simple information? This should be included, in some way, through Microsoft Graph's `/messages/{id}` endpoint directly.

[Victor Ivanidze]

Hi @piyushchugh,

could you please confirm that you cannot detect the real sender if there is "Sent on behalf of" right is assigned? 

[Victor Ivanidze]

Have a look at this: https://ivasoft.com/getrealsenderscheduledflow.shtml