mail.truehostcloud.com has no NS records.
NS records for this zone are defined at truehostcloud.com.
NS records for this zone are defined at truehostcloud.com.
Question and response
Question
dig mail.truehostcloud.com. NS
Answer
The response has no answer records.
Authority
truehostcloud.com. 1800 SOA hugh.ns.cloudflare.com. dns.cloudflare.com. 2397912496 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0