4.158-248-90.customer.lyse.net has no MX records.
Question and response
Question
dig 4.158-248-90.customer.lyse.net. MX
Answer
The response has no answer records.
Authority
customer.lyse.net. 86400 SOA ns1.lyse.net. hostmaster.lyse.net. 2008102001 10800 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0