cloud.sontheimer.de has no MX records.
Question and response
Question
dig cloud.sontheimer.de. MX
Answer
The response has no answer records.
Authority
sontheimer.de. 7200 SOA ns1.sontheimer.de. postmaster.sontheimer.de. 2025100802 28800 3600 1209600 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0