rs-0-182.acens.net has no MX records.
Question and response
Question
dig rs-0-182.acens.net. MX
Answer
The response has no answer records.
Authority
acens.net. 7200 SOA ns1.acens.net. hostmaster.acens.net. 1772801198 14400 3600 604800 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0