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Attackers can hide 'external sender' email warnings with HTML and CSS

Threat Actors
April 23, 2021
Bleeping Computer

Turns out, all it takes for attackers to alter the "external sender" warning, or remove it altogether from emails is just a few lines of HTML and CSS code, as demonstrated by a researcher.

External Sender Warnings
Email Security Bypass
HTML/CSS Code Snippet
Email Gateways
Microsoft Outlook

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