Question and response
Question
dig mx2.arsmtp.com. NS
Answer
mx2.arsmtp.com. 600 NS mdns1.appriver.com.
mx2.arsmtp.com. 600 NS mdns2.appriver.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0