NS3.ZONEDATA.NET has no MX records.
Question and response
Question
dig NS3.ZONEDATA.NET. MX
Answer
The response has no answer records.
Authority
zonedata.net. 3600 SOA ns.zone.eu. hostmaster.zone.eu. 2025051400 86400 7200 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0