lab-rot.ondemand.com has no MX records.
Question and response
Question
dig lab-rot.ondemand.com. MX
Answer
The response has no answer records.
Authority
lab-rot.ondemand.com. 300 SOA ns1.sap.net. dns.sap-ag.de. 2020082144 3537 14400 1814400 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0