BT is being investigated by the UK's data authority, after remarks from a whistleblower.
The whistleblower is said to have been a former employee of Critical Path, the company tasked with building BT's new system for email. On behalf of BT the company must switch over seven million customers from Yahoo to their service. However the whistleblower has said the method Critical Path was using was insecure.
A spokesman for BT said: "BT takes the security of all products very seriously.
"And in the process of developing new services with partners, we rigorously audit and test for security, and fix any identified issues before going into live service."
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