delta.webwide.de has no MX records.
Question and response
Question
dig delta.webwide.de. MX
Answer
The response has no answer records.
Authority
webwide.de. 300 SOA ns1.domainit.de. hostmaster.domainit.de. 2023120510 14400 3600 604800 28800
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0