Telecom is contacting some Xtra email users as it applies the latest in a series of security enhancements to the Xtra emails.
An additional encryption setting called `Secure Sockets Layer' (or `SSL'), will soon be the new standard default connection for all Yahoo Xtra mail accounts.
Telecom said today it would be helping users who access the service via a third party email client, such as Microsoft Outlook for PCs or Android for mobiles, to update their settings.
SSL secured a user's information and email messages, making communications more private as they moved between the user's browser/device and Yahoo's servers, Telecom retail chief executive Chris Quin said.
But it was important for customers take their online security as seriously as possible, he said.