Telstra Bill notifications inject my Billing Account number in the Subject field, and in the body of the email with other Personally Identifiable Information. If this was to be intercepted, this information could be used fraudulently, from a Cyber Safety perspective there should be no identifiable information in the communication.
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Thanks for getting in touch, online security is certainly a concern that we all need to take seriously.
Your personal security is very important to us & we offer advice on how to stay safe online, just like a lock on your mailbox was important a few years ago, a good password & security system in place on your systems is important.
We have a number of security systems in place to protect your services, more on that here https://www.telstra.com.au/privacy/data-security
Additional advice here https://www.telstra.com.au/consumer-advice/cyber-safety?red=/cyber-safety https://www.telstra.com.au/privacy/online-safety
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