Hi @ Haroon Peter,
Is it still stuck in the draft box? Are any DNRs returned?
If not, please refer to the following steps to view them in order:
1. Open Control Panel-Services, find Exchange Transport Service and restart.
2. Run Get-MessageTrackingLogto see the results.
- In Exchange Toolbox, open the Queue Viewer to check if any messages are stuck and check for Last error.
Maybe you can share the screenshot after removing all privacy information like domain name and email addresses.
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