📧 Troubleshooting Exchange Online Mail Flow Issues 🚀

Scenario : Outbound Email Delivery Failure

🔍 Issue: Users unable to send emails to external domains.

Check if the issue is with all users or specific individuals?

🛠️ Troubleshooting Steps:

1️⃣ Isolate the Scope: 🎯

- Determine if the issue affects all users or specific individuals.

- Encourage users to report Non-Delivery Reports (NDRs) for failed emails.

2️⃣ Review NDR Messages: 📝

- Analyze NDRs for error codes or explanations.

- Identify patterns to narrow down the root cause.

3️⃣ Message Trace: 🔍

- Utilize message trace to track failed outbound emails.

- Look for errors, delays, or unusual behavior. 🕵️♂️

4️⃣ Check Transport Rules: 🛣

- Review transport rules impacting outbound delivery.

- Ensure rules align with org’s requirements. ⚙️

5️⃣ Verify Connector Settings: ✔

- Examine outbound connector settings.

- Confirm the correct configuration and destination. 🔗

6️⃣ Sender Permissions: 🔏

- Validate users have permissions to send externally.

- Check for account limits or restrictions. 👤🚫

7️⃣ Investigate Recipient Domain: 🕵🏻

- If specific domains are affected, check for issues.

- Look for restrictions or blacklisting. 🌐🔍

By following these steps, you can pinpoint and resolve outbound email delivery failures in your Exchange Online tenant. 🌐✉️

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