dc2.iomart.com has no MX records.
Question and response
Question
dig dc2.iomart.com. MX
Answer
The response has no answer records.
Authority
dc2.iomart.com. 3600 SOA heracles.iomart.com. hostmaster.iomart.com. 2022110100 43200 1800 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0