mail.blnkserver.com has no NS records.
NS records for this zone are defined at blnkserver.com.
NS records for this zone are defined at blnkserver.com.
Question and response
Question
dig mail.blnkserver.com. NS
Answer
The response has no answer records.
Authority
blnkserver.com. 86400 SOA blnkserver.com. admin.benosborne.com. 2025081911 86400 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0