smsdh.dinaserver.com has no MX records.
Question and response
Question
dig smsdh.dinaserver.com. MX
Answer
The response has no answer records.
Authority
dinaserver.com. 300 SOA ns.dinahosting.com. hostmaster.dinaserver.com. 2019021301 3600 120 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0