Cloudflare found over 5% of global emails were malicious in 2025, peaking at Cloudflare found over 5% of global emails were malicious in 2025, peaking at

Over 1 in 20 emails are malicious, warns internet giant Cloudflare

Cloudflare found over 5% of global emails were malicious in 2025, peaking at nearly 10% in November, with more than half of them containing deceptive links.

More than 5% of all emails sent worldwide contain malicious content, according to internet infrastructure giant Cloudflare. 

The web security giant revealed that an aggregate of 5.6% of global email traffic analyzed by the firm over the past year was found to be malicious. This equates to more than one in every twenty emails containing harmful content.

In November, that figure surged to almost one in ten, nearly double the average for the year, it found. 

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