smtp.fuse.net has no NS records.
NS records for this zone are defined at fuse.net.
NS records for this zone are defined at fuse.net.
Question and response
Question
dig mail2.cbt.syn-alias.com. NS
Answer
The response has no answer records.
Authority
syn-alias.com. 300 SOA dns1.p04.nsone.net. hostmaster.nsone.net. 1653399764 3600 600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0