systems.tiggee.net has no MX records.
Question and response
Question
dig systems.tiggee.net. MX
Answer
The response has no answer records.
Authority
tiggee.net. 180 SOA ns10.digicertdns.com. dns.digicertdns.com. 2009010861 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0