mail.tmdcloud.com has no NS records.
NS records for this zone are defined at tmdcloud.com.
NS records for this zone are defined at tmdcloud.com.
Question and response
Question
dig mail.tmdcloud.com. NS
Answer
The response has no answer records.
Authority
tmdcloud.com. 1800 SOA bonnie.ns.cloudflare.com. dns.cloudflare.com. 2397388107 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0