By appending just a few lines of HTML and CSS code, researcher Louis Dion-Marcil showed how an external sender could hide the very warning from an email message. Hiding "external sender" warning ...

Cisco Talos says hackers are abusing CSS in emails The stylesheet language is used to hide content, track people's behavior, and more Researchers suggest IT teams adopt advanced filtering techniques ...

Researchers say cybercriminals can have fun bypassing one of Microsoft's anti-phishing measures in Outlook with some simple CSS tweaks. William Moody, IT security consultant at Certitude, blogged ...