customer.lyse.net has no MX records.
Question and response
Question
dig 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