ns2.sedoparking.com has no MX records.
Question and response
Question
dig ns2.sedoparking.com. MX
Answer
The response has no answer records.
Authority
sedoparking.com. 10800 SOA ns-1057.awsdns-04.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0