mail.oktiv.net has no MX records.
Question and response
Question
dig mail.oktiv.net. MX
Answer
The response has no answer records.
Authority
oktiv.net. 2560 SOA ns1.sisgroup.com.au. hostmaster.amaze.com.au. 1565568146 16384 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0