mail.choicesst.com has no NS records.
NS records for this zone are defined at choicesst.com.
NS records for this zone are defined at choicesst.com.
Question and response
Question
dig mail.choicesst.com. NS
Answer
The response has no answer records.
Authority
choicesst.com. 1800 SOA damiete.ns.cloudflare.com. dns.cloudflare.com. 2395872625 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0