kumo.sensorpro.app has no MX records.
Question and response
Question
dig kumo.sensorpro.app. MX
Answer
The response has no answer records.
Authority
sensorpro.app. 1800 SOA suzanne.ns.cloudflare.com. dns.cloudflare.com. 2396931607 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0