m.en25.com has no MX records.
Question and response
Question
dig m.en25.com. MX
Answer
The response has no answer records.
Authority
m.en25.com. 300 SOA ns1.p201.dns.oraclecloud.net. hostmaster.m.en25.com. 5753 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0