nsc.l3ia.net has no MX records.
Question and response
Question
dig nsc.l3ia.net. MX
Answer
The response has no answer records.
Authority
l3ia.net. 86400 SOA dns.ovh.net. tech.ovh.net. 2020121203 86400 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0