See a possible solution here:
https://superuser.com/questions/1741916/shared-mailbox-user-tracking
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How to check and where to check who has sent an email from sharedmailbox as there are 4 members in that Sharedmailbox and need to find which individual has sent out that particular email to the group of users or DL?
See a possible solution here:
https://superuser.com/questions/1741916/shared-mailbox-user-tracking
Hello @Vinod Survase ,
If you are using Exchange online, you can enable auditing for the shared mailbox and then search the logs in the Security and Compliance center. Related thread: https://answers.microsoft.com/en-us/msoffice/forum/all/identifying-who-sent-an-email-from-a-shared/2225cfc9-4ca2-4bf1-ad6b-b3d71a8d9de0