Telecom says its customers are no longer compromised by the cyber attack that caused 65,000 people to be locked out of their email accounts over the past fortnight.
The trouble began about 9 February with a cyber attack that led some Yahoo! Xtra customers to inadvertently send out potentially corrupting emails to their contacts.
It prompted Telecom to cancel about 87,000 passwords from individual accounts in order to preserve their security.
Telecom says 65,000 people have now changed their passwords and the remaining accounts are considered inactive as they have not been accessed for at least 90 days.
The company says there is no evidence that any of the accounts were accessed for any other reason than to send spam.