Optus, and CEO Stephen Rue, have been under pressure since last month's triple-zero outage. Photo: Dave Hunt/AAP PHOTOS

The federal government only learned about Optus' deadly triple-zero outage the day after it happened because the telecommunications provider sent a notification email to the wrong address.

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Optus was required by regulation to notify the Department of Communications about the emergency call outage, which was linked to three deaths, on Thursday September 18.

The Singapore-owned telco sent two emails to the department on the day, one at 2.45pm notifying about the outa

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