pnrcon.net has no MX records.
Question and response
Question
dig pnrcon.net. MX
Answer
The response has no answer records.
Authority
pnrcon.net. 1800 SOA anahi.ns.cloudflare.com. dns.cloudflare.com. 2397038807 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0