guru has no MX records.
Question and response
Question
dig guru. MX
Answer
The response has no answer records.
Authority
guru. 3600 SOA v0n0.nic.guru. hostmaster.donuts.email. 1772010359 7200 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0