• #554 5.4.4 Smtpsend.dns.mxloopback Dns Records For This Domain Are Configured In A Loop ##rfc822
• #554 5.4.4 Smtpsend.dns.mxloopback Dns Records For This Domain Are Configured In A Loop ##

Getting a message like: #554 5.4.4 SMTPSEND.DNS.MxLoopback; DNS records for this domain are configured in a loop ## does not tell very much, thusforth it is impossible to start troubleshooting this for us at experts exchange. “554 5.4.4 SMTPSEND.DNS.NonExistentDomain; nonexistent domain”. Investigation: I started to investigate what could cause the problem. It was DNS error, so I started to use NSLOOKUP tool and tried to resolve DNS name for next hop domain. The answer was different, then I thought it would be.

451 4.4.0 DNS query failed Exchange Server error in message queue. 6/19/2019. 2 minutes to read.In this article Error occurs when you send email to specific remote domainsThis problem may occur because the remote DNS servers ignore the AAAA query or return an unexpected response.To work around this issue, create send connectors for the affected remote domains. (Create a send connector for each domain).

Then, configure the send connectors to use the mail server in the remote domain as a smart host. To do this, follow these steps:. Check the IP address of the MX record (mail server) for the affected remote domain. To do this, use nslookup or. Create a new send connector for this domain.

#554 5.4.4 Smtpsend.dns.mxloopback Dns Records For This Domain Are Configured In A Loop ##rfc822

Make sure that you configure the following settings:. In the Address space section, add the affected remote domain such as contoso.com.2. In the Network setting section, select Route mail through the following smart hosts.

#554 5.4.4 Smtpsend.dns.mxloopback Dns Records For This Domain Are Configured In A Loop ##

Add the IP address of the MX record that you checked in step 1.3. Set Smart host authentication settings to None.For other settings, you can use the default value. For more information, see.When Exchange Server sends email to this remote domain, it will now bypass the DNS query and connect the mail server in the remote domain by using the IP address directly. Error occurs when you send email to all remote domainsThis problem may occur because the DNS server that Microsoft Exchange Server uses is not working. By default, Exchange Server uses network adapter DNS settings for outgoing remote mail routing.To resolve this issue, fix the issues in your local DNS server, or configure the external DNS server for remote mail routing.

To configure the external DNS server for remote mail routing, follow these steps:.Open the Proprieties page of the Exchange server that hosts the send connector, and then add the IP address of in the External DNS Lookups setting.Select the Use the external DNS lookup settings on servers with the transport roles option in the send connector that is responsible for remote mail routing.Feedback.