gtei.net has no MX records.
Question and response
Question
dig gtei.net. MX
Answer
The response has no answer records.
Authority
gtei.net. 1800 SOA dnsauth1.sys.gtei.net. dns.level3.net. 2011092200 3600 900 864000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0