Event ID:3018
Component:Microsoft Exchange Transport
Message:A non-delivery report with a status code of <number> was generated for recipient <proxy address> (Message-ID <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.

This event is logged when a non-delivery report is generated because of a problem with DNS or an IP address. The numeric code is generally 5.4.0. This indicates that an "Authoritative Host was not found".

For details, see Microsoft Knowledge Base article 284204 Delivery status notifications in Exchange Server and in Small Business Server.

User Action

To resolve this error, try one or more of the following:

  • Use the command line tool NSlookup to verify that DNS is correctly configured. For example, make sure that the target domain can be resolved. Additionally, make sure that an MX or A record can be found. For information about how to use NSlookup, see Microsoft Knowledge Base article 200525 Using NSlookup.exe.
  • Verify that the IP Address is in IPv4 literal format.
  • Verify that an overriding fully-qualified domain name or hosts name is not present in the HOSTS file on this Exchange server.

Currently there are no Microsoft Knowledge Base articles available for this specific error or event message. For information about other support options you can use to find answers online, see