Optus missed the mark with emails to the federal government alerting of triple-zero outages. Photo: Mick Tsikas/AAP PHOTOS

Optus sent emails notifying the federal communications department about a deadly triple-zero outage to the wrong email address, leaving authorities in the dark for more than a day.

Subscribe now for unlimited access .

Login or signup to continue reading All articles from our website The digital version of Today's Paper All other regional websites in your area Continue

The telco's startling mistake was revealed in a parliamentary hearing on Wednesday, along with the admission it underplayed the severity of the issue.

The Singaporean-owned telco sent two emails to the department on September 18, the same day a routine firewall upgrade knocked out em

See Full Page