ns3.pt.lu has no MX records.
Question and response
Question
dig ns3.pt.lu. MX
Answer
The response has no answer records.
Authority
pt.lu. 600 SOA ns1.pt.lu. hostmaster.ns1.pt.lu. 2026021800 10800 3600 2419200 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0