relay03.peerlessnetwork.com has no MX records.
Question and response
Question
dig relay03.peerlessnetwork.com. MX
Answer
The response has no answer records.
Authority
peerlessnetwork.com. 300 SOA dns1.easydns.com. zone.easydns.com. 1769362199 3600 600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0