The Information Commissioner’s Office has warned organisations to use alternatives to the blind carbon copy (BCC) email function when sending emails containing sensitive personal information, following a series of business blunders.

The warning comes as the ICO has published new guidance to help organisations understand the law and good practice around protecting personal information when sending bulk emails. Mihaela Jembei, ICO director of regulatory cyber, said: “Failure to use BCC correctly in emails is one of the top data breaches reported to us every year, and these breaches can cause real harm, especially where sensitive personal information is involved.

“While BCC can be a useful function, it's not enough on its own to properly protect people's personal information. We’re asking organisations to assess the nature of the information and the potential security risks when deciding on the best method to communicate with staff or customers. If organisations are sending any sensitive personal information electronically, they should use alternatives to BCC, such as bulk email services, mail merge, or secure data transfer services.

“This new guidance is part of our commitment to help organisations get email security right. However, where we see negligent behaviour that puts people at risk of harm, we will not hesitate to use the full suite of enforcement tools available to us.”

Failure to use appropriate methods to send bulk communications has resulted in recent ICO enforcement action. Earlier this month, the ICO reprimanded two Northern Irish organisations for disclosing people’s information inappropriately via email. And in March, the ICO issued a reprimand to NHS Highland for a “serious breach of trust” after a data breach involving those likely to be accessing HIV services.

According to ICO data, failure to use BCC correctly is consistently within the top 10 non-cyber breaches, with nearly a thousand reported since 2019. The education sector is the biggest offender for BCC breaches, with health in second, then local government, retail and the charity sector rounding out the top five.

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