0.bb44.39networks.net has no MX records.
Question and response
Question
dig 0.bb44.39networks.net. MX
Answer
The response has no answer records.
Authority
39networks.net. 1800 SOA lara.ns.cloudflare.com. dns.cloudflare.com. 2397323023 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0