mx-1.hollander-jacobsen.de has no MX records.
Question and response
Question
dig mx-1.hollander-jacobsen.de. MX
Answer
The response has no answer records.
Authority
hollander-jacobsen.de. 3600 SOA a.xnameserver.de. hostmaster.inwx.de. 2026021001 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0