mx.vkeyboard.com has no NS records.
NS records for this zone are defined at vkeyboard.com.
NS records for this zone are defined at vkeyboard.com.
Question and response
Question
dig mx.vkeyboard.com. NS
Answer
The response has no answer records.
Authority
vkeyboard.com. 3600 SOA dns.vkeyboard.com. hostmaster.vkeyboard.com. 1743219917 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0