mail.lissod.com has no NS records.
NS records for this zone are defined at lissod.com.
NS records for this zone are defined at lissod.com.
Question and response
Question
dig mail.lissod.com. NS
Answer
The response has no answer records.
Authority
lissod.com. 3600 SOA nsa4.srv53.net. support.dnshosting.org. 1755531140 1800 600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0