Optus sent its notifications to the government about its massive triple-zero outage that led to the deaths of three people to the wrong email address, it has been revealed.

Addressing Senate estimates this morning, Deputy Secretary James Chisholm said Optus sent two emails about the outage on September 18 – the first at 2.45pm when it was detected, and the second seven minutes later when it was fixed — were sent to an old, out-of-date address.

The inbox wasn't monitored, so it wasn't until the next afternoon that the department found out about the outage.

"We have systems in place for notification. That requires information being sent to the right place," Chisholm said.

"That email was not even sent to the right place."

This was despite Optus using the correct email address before the

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