ns.blacknightsolutions.com has no MX records.
Question and response
Question
dig ns.blacknightsolutions.com. MX
Answer
The response has no answer records.
Authority
blacknightsolutions.com. 900 SOA ns.blacknightsolutions.com. sales.blacknight.ie. 2025051441 10800 3600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0