mx.sitevalley.com has no NS records.
NS records for this zone are defined at sitevalley.com.
NS records for this zone are defined at sitevalley.com.
Question and response
Question
dig mx.sitevalley.com. NS
Answer
The response has no answer records.
Authority
sitevalley.com. 3600 SOA dns1.swiftycdn.net. hostmaster.swiftycdn.net. 2021111744 7200 3600 86400 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0