preview.systec-co.com has no MX records.
Question and response
Question
dig preview.systec-co.com. MX
Answer
The response has no answer records.
Authority
systec-co.com. 43200 SOA ns1.systec-co.com. hostmaster.systec-co.com. 2012062276 36000 3600 1209600 43200
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0