root-c2.pknic.pk has no MX records.
Question and response
Question
dig root-c2.pknic.pk. MX
Answer
The response has no answer records.
Authority
pk. 14400 SOA pknic.pk. staff.pknic.net.pk. 2026022575 10700 900 1209600 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0