ssdvps-21208.vps.net has no MX records.
Question and response
Question
dig ssdvps-21208.vps.net. MX
Answer
The response has no answer records.
Authority
vps.net. 900 SOA dns1.vps.net. hostmaster.vps.net. 2026030302 7200 600 1728000 900
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0