0.8.2.ip6.arpa has no MX records.
Question and response
Question
dig 0.8.2.ip6.arpa. MX
Answer
The response has no answer records.
Authority
0.8.2.ip6.arpa. 10800 SOA ns.lacnic.net. hostmaster.lacnic.net. 2026022752 1800 900 691200 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0