mail.dnsracks.net has no MX records.
Question and response
Question
dig mail.dnsracks.net. MX
Answer
The response has no answer records.
Authority
dnsracks.net. 86400 SOA ns3.wiplon.com. hostmaster.dnsracks.net. 2023101301 3600 900 604800 14400
Additional
The response has no additional records.