ns2.gldn.net has no MX records.
Question and response
Question
dig ns2.gldn.net. MX
Answer
The response has no answer records.
Authority
gldn.net. 3600 SOA ns1.gldn.net. dnsmaster.gldn.net. 2026021801 3600 1800 3600000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0