dns3.ramnode.com has no MX records.
Question and response
Question
dig dns3.ramnode.com. MX
Answer
The response has no answer records.
Authority
ramnode.com. 1800 SOA isla.ns.cloudflare.com. dns.cloudflare.com. 2397340810 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0