routing-by.as58212.net has no MX records.
Question and response
Question
dig routing-by.as58212.net. MX
Answer
The response has no answer records.
Authority
as58212.net. 1800 SOA alaric.ns.cloudflare.com. dns.cloudflare.com. 2397003925 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0