sof.lwldns.net has no MX records.
Question and response
Question
dig sof.lwldns.net. MX
Answer
The response has no answer records.
Authority
lwldns.net. 300 SOA master.lwldns.net. hostmaster.lightningwirelabs.com. 2026024731 10800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0