ns4.redcondor.net has no MX records.
Question and response
Question
dig ns4.redcondor.net. MX
Answer
The response has no answer records.
Authority
redcondor.net. 300 SOA ns4.redcondor.net. netops.gosecure.net. 2023019100 300 60 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0