smtp1.tiggee.com has no MX records.
Question and response
Question
dig smtp1.tiggee.com. MX
Answer
The response has no answer records.
Authority
smtp1.tiggee.com. 180 SOA ns11.constellix.com. dns.constellix.com. 2015010122 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0