ns3.dnsrubycom.com has no MX records.
Question and response
Question
dig ns3.dnsrubycom.com. MX
Answer
The response has no answer records.
Authority
dnsrubycom.com. 600 SOA ns07.domaincontrol.com. dns.jomax.net. 2025042509 28800 7200 604800 600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0