static.exetel.com.au has no MX records.
Question and response
Question
dig static.exetel.com.au. MX
Answer
The response has no answer records.
Authority
static.exetel.com.au. 18000 SOA ns1.exetel.com.au. postmaster.exetel.com.au. 2018100500 4800 3600 604800 38400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0