ns3.nic.dz has no MX records.
Question and response
Question
dig ns3.nic.dz. MX
Answer
The response has no answer records.
Authority
nic.dz. 36000 SOA ns1.nic.dz. dnsmaster.nic.dz. 2026011800 86400 1800 2592000 36000
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0