ntp1.ggsrv.de has no MX records.
Question and response
Question
dig ntp1.ggsrv.de. MX
Answer
The response has no answer records.
Authority
ggsrv.de. 900 SOA ns1.hosting.de. hostmaster.ggsrv.de. 2026012802 86400 7200 3600000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0