“Documents recently obtained by the conservative advocacy group Judicial Watch show that in December 2010, then-US Secretary of State Hillary Clinton and her staff were having difficulty communicating with State Department officials by e-mail because spam filters were blocking their messages. To fix the problem, State Department IT turned the filters off—potentially exposing State’s employees to phishing attacks and other malicious e-mails.
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Source: Clinton’s private e-mail was blocked by spam filters—so State IT turned them off | Ars Technica