pwm4205113.lnk.telstra.net has no MX records.
Question and response
Question
dig pwm4205113.lnk.telstra.net. MX
Answer
The response has no answer records.
Authority
lnk.telstra.net. 6400 SOA dns0.telstra.net. hostmaster.telstra.net. 2021366549 10800 3600 604800 6400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0