178.125.211.in-addr.arpa has no MX records.
Question and response
Question
dig 178.125.211.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
178.125.211.in-addr.arpa. 3600 SOA ns11.pwd.ne.jp. postmaster.pwd.ne.jp. 2008052601 10800 1800 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0