If you wish to purchase marketing lists to send commercial electronic messages, it is your responsibility to determine whether consent has been obtained from each person on the list. Under the Spam Act, you may have to prove that consent has been obtained to send messages. It is not sufficient to assume that mobile telephone numbers or email addresses have been obtained with the consent of the account-holder without having proof of this from the provider.
Before purchasing a marketing list, you may wish to seek written details of how the provider obtained the email addresses or mobile telephone numbers and under what terms and conditions. Think carefully about whether you can rely on inferred consent and remember you must still include accurate sender identification information and an unsubscribe facility in your messages.