Telstra is an Australian telecommunications provider that offers internet services, including email, to its 18.8 million customer accounts. Telstra’s email domains include telstra.com, telstra.com.au, bigpond.com, bigpond.com.au, and msn.com.au. They also host email for a few other domains and companies. If you have a Telstra/Bigpond-related deliverability issue, you can suppress mail to these domains by combining all the listed domains as your initial grouping.
Excerpt from the main article:
Australian telecommunications provider Telstra has long provided internet services (including email), initially via the “Bigpond” brand (launched in 1996, later retired). They’re reported to have 18.8 million customer accounts, though I don’t know how many active email accounts that translates to. Even if you assume a 1:1 correlation between user accounts and email accounts (which is unlikely), that’s still quite a bit smaller than, say, Yahoo Mail (which was reported as having 225 million active users as of 2017). Regardless, a multi-million subscriber base is nothing to sneeze at.I don’t have much information on blocking/unblocking information for senders with Telstra/Bigpond delivery issues at this time. I’ll add information here as I’m able to.In the mean time, if you are having a Telstra/Bigpond-related deliverability issue, and if you would like to segment out or suppress mail to the Telstra domains, here’s a list of their primary email domains:telstra.comtelstra.com.aubigpond.combigpond.com.auTelstra hosts email for
Reference: Telstra Email Domains was originally published on Spam Resource: All Things Deliverability
