37-221-95-173.rltx.net has no MX records.
Question and response
Question
dig 37-221-95-173.rltx.net. MX
Answer
The response has no answer records.
Authority
rltx.net. 1800 SOA osmar.ns.cloudflare.com. dns.cloudflare.com. 2397010359 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0