smart.ondmarc.com has no MX records.
Question and response
Question
dig smart.ondmarc.com. MX
Answer
The response has no answer records.
Authority
smart.ondmarc.com. 1799 SOA ns-smart.ondmarc.com. team.ondmarc.com. 42 10000 2400 604800 3600
Additional
The response has no additional records.