![Machine generated alternative text: Office 365 Security & Compliance Home Alerts Permissions — Classification Records management Information govemance @ Supervision Threat management Home > Message trace Run a message trace to track the flow of email messages in your organization. This can help you troubleshoot mail flow issues by determining if messages w Start a trace O A Default queries (5) CD Refresh Details Summary report Last 1 day(s), Sender: Messages sent from my primary domain in the last day O Messages received by my primary domain in the last day Messages pending delivery to users in my organization All quarantined messages for the last 7 days All failed messages for the last 7 days Custom queries (o) Autosaved queries (1) Downloadable reports (1) Recipient: All Mail flow Dashboard Message trace Summary report Last 1 day(s), Sender: All, Recipient: Summary report Last 3 day(s), Pending, Sender: All, Recipient: Summary report Last 7 day(s), Quarantined, Sender: All, Recipient: All Summary report Last 7 day(s), Failed, Sender: All, Recipient: All Queries created and saved by admins in your organization Last 10 queries that were run but not saved manually Downloadable message trace reports (completed and pending) 2 ]()

- Fill out the necessary information to try and locate the emails and click search. - If you see the messages here it will give you a status of them. - If you do not see the message here it is a decent indication that it was: 1. Blocked by a spam filter before reaching O365 (via Barracuda or other service) 2. Blocked by a server on the sender's side.