Office 365 - Trace where messages are getting stuck

If you’re an Office 365 Midsize Business, Office 365 Business, or Office 365 Enterprise admin, you access and run the message trace tool through the Exchange admin center. To get there, do the following:

  1. Sign in to Office 365 with your work or school account.

  2. Select the app launcher icon Office 365 app launcher icon in the upper-left and choose Admin.

  3. Go to Exchange.

    Sceenshot of the Office 365 admin center with Exchange selected.
  4. Under mail flow, go to message trace.

If you’re an Office 365 Small Business admin, do the following to find message trace:

  1. Go to Admin > Service settings > Email, calendar, and contacts.

  2. Under Email troubleshooting, click Troubleshoot message delivery.