| Event Id | 3018 |
| Source | NDR |
| Description | A non-delivery report with a status code of 5.4.0 was generated for recipient <recipient> (Message-ID <message id>). Causes: This message indicates a DNS problem or an IP address configuration problem. Solution: Check the DNS using nslookup or dnsq. Verify the IP address is in IPv4 literal format. |
| Event Information | Following Microsoft article may help you to resolve this problem. |
| Reference Links | Public
Folder Hierarchy and Content Is Not Being Replicated Across Routing Groups Troubleshooting Non-Delivery Reports |
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