213.182.203.in-addr.arpa has no MX records.
Question and response
Question
dig 213.182.203.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
213.182.203.in-addr.arpa. 3600 SOA ns6.intervia.ad.jp. ns-admin.intervia.ad.jp. 2025040900 3600 900 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0