mailcloud.trunkoz.com has no MX records.
Question and response
Question
dig mailcloud.trunkoz.com. MX
Answer
The response has no answer records.
Authority
trunkoz.com. 3600 SOA ns1.trunkoz.com. hostmaster.trunkoz.com. 2464 900 600 86400 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0