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TechRadar
TechRadar
Sead Fadilpašić

Proofpoint email filter flaw exploited to send out millions of phishing messages

Phishing.

Cybercriminals found a way to send millions of “perfectly spoofed” phishing emails thanks to a vulnerability in Proofpoint’s email relay servers.

Experts from Guardio Labs revealed the phishing campaign started in January 2024, and was sending out an average of three million emails daily. In early June, it peaked with 14 million emails being disseminated.

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