corp.cloud.im has no MX records.
Question and response
Question
dig corp.cloud.im. MX
Answer
The response has no answer records.
Authority
corp.cloud.im. 3600 SOA ns1.na.cloud.im. root.linmn.na.cloud.im. 253538 14400 7200 2419200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0