ntppool.hanse.de has no MX records.
Question and response
Question
dig ntppool.hanse.de. MX
Answer
The response has no answer records.
Authority
hanse.de. 1800 SOA ns1.hanse.de. hostmaster.hanse.de. 2026022600 14400 1800 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0