www.mktf.com.au has no MX records.
Question and response
Question
dig www.mktf.com.au. MX
Answer
The response has no answer records.
Authority
mktf.com.au. 300 SOA dns1.cscdns.net. hostmaster.cscdns.net. 2019121005 10800 1800 2419200 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0