Telecom cancelled the passwords of about 60,000 Yahoo!Xtra email accounts on Saturday night to stop spam being sent from customers' accounts.
Customers unable to log on had to change their passwords through the Xtra/Yahoo website after answering security questions. Once they had access to their usual email account, they were greeted with an email from Telecom saying: "We have cancelled your current password and you will need to, or have had to, change your password immediately to use your email account."
Last night, customers attempting to change their passwords through the Xtra/Yahoo website were advised of delays of up to an hour.
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About 15,000 Telecom customers had earlier been told about the need to get a new password after a cyber attack last weekend.