mail.telstraglobal.net has no SRV records.
Question and response
Question
dig mail.telstraglobal.net. SRV
Answer
The response has no answer records.
Authority
telstraglobal.net. 86401 SOA ns03.telstraglobal.net. ipnoc.telstraglobal.net. 2026022701 3600 3600 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0