ns2.lighthosting.net has no MX records.
Question and response
Question
dig ns2.lighthosting.net. MX
Answer
The response has no answer records.
Authority
lighthosting.net. 14400 SOA ns.lh.pl. root.lh.pl. 2008052701 1200 600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0