req1222.p2p.bs4b.net has no MX records.
Question and response
Question
dig req1222.p2p.bs4b.net. MX
Answer
The response has no answer records.
Authority
bs4b.net. 1800 SOA carioca.ns.cloudflare.com. dns.cloudflare.com. 2397560922 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0