dns.schlax-sasser.com has no MX records.
Question and response
Question
dig dns.schlax-sasser.com. MX
Answer
The response has no answer records.
Authority
schlax-sasser.com. 3600 SOA dns.schlax-sasser.com. hostmaster.schlax-sasser.com. 1175478925 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0