Subscription Bombing: Email under Attack

Payer, Mathias

doi:10.1145/3797487

Subscription Bombing: Email under Attack

2026-05-01

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DOI：10.1145/3797487

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EMAIL SUBSCRIPTION BOMBING (also known as subscription flooding or email spam bombing) is an attack technique that overwhelms a target's inbox with a high volume of benign but unwanted emails. The emails themselves are benign and are sent by legitimate third parties (such as mailing lists), and therefore typically pass spam filters. The origins of this attack vector trace back to the beginning of the public Internet but have recently re-emerged at scale. Unlike classic email bombing, where attackers send large volumes directly, subscription bombing introduces a layer of indirection. The attacker registers the victim's

Subscription Bombing: Email under Attack

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