mail.dalcomtelecom.com has no NS records.
NS records for this zone are defined at dalcomtelecom.com.
NS records for this zone are defined at dalcomtelecom.com.
Question and response
Question
dig mail.dalcomtelecom.com. NS
Answer
The response has no answer records.
Authority
dalcomtelecom.com. 1800 SOA chip.ns.cloudflare.com. dns.cloudflare.com. 2396151372 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0