go.com has no MX records.
Question and response
Question
dig go.com. MX
Answer
The response has no answer records.
Authority
go.com. 1800 SOA aa-eorcrp-dscsgm4-ns.disney.com. dns-ops.dig.com. 2021015451 1200 300 2419200 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0