Memory company Crucial has sent a letter to customers warning that their email addresses may have been compromised in the Epsilon data breach.
Crucial warned customers on Wednesday not to respond to phishing email requests for sensitive financial information. "We will not send you emails asking for your credit card number, social security number or other personally identifiable information," Crucial said. "If we ever asked for this information, you can be confident it is not from Crucial."
Epsilon, which sends around 40 billion marketing emails per year, said on Friday that it had suffered a data breach affecting the customers of around 50 of its clients.
A number of companies, including Marks & Spencer in the UK, have since warned customers to be on the look-out for possible scam emails. The company said it was awaiting the results of an Epsilon investigation before deciding on the future of its relationship with the company.
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