What does the "DNS test Query" settings do?

Document ID : KB000111970
Last Modified Date : 23/08/2018
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There is the "DNS test query" field in The Configuration >> Monitor >> the "General Monitoring Parameters" tab on the PAM client.
What is it used?
Regarding the "DNS test query" field, it will be used like the below scenario. 
  1. The sending email uses the SMTP. 
  2. The SMTP depends on the DNS. 
  3. When a value is input to the "DNS test Query" field,PAM will perform to solve the destination address that is specified by the "DNS test Query" field by using the DNS server that is speciffied the Configuration >> Network >> Network settings. 
  4. The PAM SMTP service needs this process by internal. So, there is the "DNS test Query" field.