ns1.isprit2.de has no MX records.
Question and response
Question
dig ns1.isprit2.de. MX
Answer
The response has no answer records.
Authority
isprit2.de. 900 SOA ns0.isprit2.de. hostmaster.xq11.com. 2026030501 28800 1800 691200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0