Computer users with Yahoo! Xtra email accounts should delete any suspicious emails they receive - even from people they know - as Telecom investigates a possible virus.
A Telecom spokeswoman said the company was working urgently with Yahoo! to investigate the issue that hit some users today.
People have reported receiving numerous suspicious emails with `Hi' or `Hello' in the subject line and a link to click.
``If a customer thinks that their Yahoo! Xtra account may have been compromised - that is, if they think their account has been used to send spam - we advise them to change their password as soon as possible to re-secure the account.''
Advice on how to do this could be found on Telecom's website, www.telecom.co.nz/emailpasswordhelp.