Optus sent two emails to an incorrect address at the Department of Communications, alerting it of the Triple Zero outage on September 18, despite the telco giant updating its system a week earlier to have emails sent to the department’s correct email channels.

Three people died during the Triple Zero outage while unable to contact emergency services.

Appearing before a Senate estimates hearing on Wednesday, department officials confirmed that Optus was notified of the email change a week before the outage on September 11, and had updated its systems to reflect the change, but still sent emails about the outage to the wrong address.

The two emails were sent seven minutes apart to a defunct email address and were not found until the department later scoured its systems. The emails were a

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