n.nic.net.sa has no MX records.
Question and response
Question
dig n.nic.net.sa. MX
Answer
The response has no answer records.
Authority
nic.net.sa. 3600 SOA ns1.nic.sa. hostmaster.nic.sa. 2026022503 10800 3600 3600000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0