A DNS error, the host server for the recipient domain name cannot be found

Causes

• Normally due to misspelling of the domain name part of a recipient email address.
• If email address is correct, then it may be due to your mail server network configuration or conf

Fixes

Step 1: Incorrect Domain Names

Check all the recipient email address for incorrect domain names.

Step 2: Verify DNS Records

Verify DNS records for the domain with tools such as IntoDNS or MXToolBox.