smtp.cue.telconet.net has no NS records.
NS records for this zone are defined at cue.telconet.net.
NS records for this zone are defined at cue.telconet.net.
Question and response
Question
dig smtp.cue.telconet.net. NS
Answer
The response has no answer records.
Authority
cue.telconet.net. 900 SOA ns1.telconet.net. abuse.telconet.net. 9 10800 3600 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0