v1.h3.root-servers.org has no MX records.
Question and response
Question
dig v1.h3.root-servers.org. MX
Answer
The response has no answer records.
Authority
root-servers.org. 3600 SOA v1.h4.root-servers.org. hostmaster.root-servers.org. 2026022300 3600 300 604800 3600
Additional
. 0 OPT ; payload 1500, xrcode 0, version 0, flags 0