Some DNS records for domain "%1" could not be resolved to IP addresses. The last error was %2. The remaining records were ...

Some DNS records for domain "%1" could not be resolved to IP addresses. The last error was %2. The remaining records were resolved and will be used to attempt mail delivery. A partially resolved MX record list may indicate a configuration error with the DNS records of the target domain. To avoid potential mail loops caused by using partially-resolved MX record lists, you can set the "DnsFaultTolerance" key in EdgeTransport.exe.config to "Normal" but you may see growing queues. If this problem persists, contact the administrator of the remote domain.