ems.esendex.net has no MX records.
Question and response
Question
dig ems.esendex.net. MX
Answer
The response has no answer records.
Authority
esendex.net. 3600 SOA ns-a.eurodns.com. hostmaster.eurodns.com. 2025082100 43200 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0