colt1.inetserver.de has no MX records.
Question and response
Question
dig colt1.inetserver.de. MX
Answer
The response has no answer records.
Authority
colt1.inetserver.de. 3600 SOA master.domainkunden.de. hostmaster.domainkunden.de. 2024121802 28800 7200 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0