mail.telstraglobal.net has no MX records.
Question and response
Question
dig mail.telstraglobal.net. MX
Answer
The response has no answer records.
Authority
telstraglobal.net. 86401 SOA ns03.telstraglobal.net. ipnoc.telstraglobal.net. 2026022001 3600 3600 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0