smtp3.arsalon.net has no MX records.
Question and response
Question
dig smtp3.arsalon.net. MX
Answer
The response has no answer records.
Authority
arsalon.net. 3600 SOA ns1.dfw.databank.com. ipadmin.databank.com. 2026021901 7200 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0