smtp.linkem.com has no NS records.
NS records for this zone are defined at linkem.com.
NS records for this zone are defined at linkem.com.
Question and response
Question
dig smtp.linkem.com. NS
Answer
The response has no answer records.
Authority
linkem.com. 43200 SOA barakus.tiscali.com. nsadmin.it.tiscali.com. 2025092500 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0