EnergyAustralia customers have been warned of an email scam that encourages them to part with financial details.
The hoax email informs them that a payment has been turned down by their bank, before asking them to click on a link.
EnergyAustralia has urged customers not to click on the link, which states "in the absence of confirmation from you within 15 days, we will proceed to cancel your phone line".
They are told to delete the email and get in touch with the company, the ACCC Infocentre or any state or territory fair trading authority.
EnergyAustralia also took the opportunity to remind its customers that it would never ask for personal or credit card information – the hoax has been reported to the necessary authorities for investigation.
The company is not the only one likely to be carrying out a security audit at the moment, as it emerged that medical patients in the US may also have had their personal data compromised.
Computers were stolen from the Advocate Medical Group, many of which contained information such as names, addresses, social security numbers and dates of birth.
It is estimated that millions of people's details may have been compromised as a result of the incident.