reserved.as215248.net has no MX records.
Question and response
Question
dig reserved.as215248.net. MX
Answer
The response has no answer records.
Authority
as215248.net. 1800 SOA liz.ns.cloudflare.com. dns.cloudflare.com. 2396585582 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0