_netblocks.net.hostasaurus.com has no MX records.
Question and response
Question
dig _netblocks.net.hostasaurus.com. MX
Answer
The response has no answer records.
Authority
hostasaurus.com. 14400 SOA ns3.hostasaurus.com. hostmaster.hostasaurus.com. 1769190313 16384 2048 1048576 300
Additional
The response has no additional records.