omx3.dca.net has no MX records.
Question and response
Question
dig omx3.dca.net. MX
Answer
The response has no answer records.
Authority
dca.net. 3600 SOA dns.dca.net. root.dca.net. 2026011801 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0