156.4.93.62.dsl.xitylight.de has no MX records.
Question and response
Question
dig 156.4.93.62.dsl.xitylight.de. MX
Answer
The response has no answer records.
Authority
dsl.xitylight.de. 86400 SOA ns.tng.de. hostmaster.tng.de. 2015011601 14400 7200 3600000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0