ip-36-0-48-86.static.contabo.net has no MX records.
Question and response
Question
dig ip-36-0-48-86.static.contabo.net. MX
Answer
The response has no answer records.
Authority
contabo.net. 3600 SOA ns1.contabo.net. hostmaster.contabo.de. 1772512837 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0