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 telecommunications giant updating its system a week earlier to have emails sent to the department’s correct channels.

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.

Emails sent from Optus went to the wrong email address. Credit: Sitthixay Ditthavong

The two emails, sent seven minutes apart to a defunct email address on the afternoon of September 18, understated the extent of the 13-hour crisis, and w

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