mail.asurahosting.com has no NS records.
NS records for this zone are defined at asurahosting.com.
NS records for this zone are defined at asurahosting.com.
Question and response
Question
dig mail.asurahosting.com. NS
Answer
The response has no answer records.
Authority
asurahosting.com. 1800 SOA joan.ns.cloudflare.com. dns.cloudflare.com. 2398784591 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0