dhcp.as2116.net has no MX records.
Question and response
Question
dig dhcp.as2116.net. MX
Answer
The response has no answer records.
Authority
dhcp.as2116.net. 600 SOA dns1.as2116.net. hostmaster.as2116.net. 2020060800 28800 3600 2419200 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0