dsl.as8758.net has no MX records.
Question and response
Question
dig dsl.as8758.net. MX
Answer
The response has no answer records.
Authority
dsl.as8758.net. 3600 SOA ns1.as8758.net. hostmaster.as8758.net. 2018013102 86400 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0