This vulnerability put anyone who was in communication with her clintonemail.com account while she was secretary of state at risk of being hacked. Clinton said at the United Nations last week that there were no security breaches of her personal e-mail server, which she used to send and receive more than 60,000 professional and personal e-mails. But former cyber-security officials and experts told us that there were gaps in the system.
According to publicly available information, whoever administrated the system didn’t enable what’s called a Sender Policy Framework, or SPF, a simple setting that would prevent hackers sending e-mails that appear to be from clintonemail.com. SPF is a basic and highly recommended security precaution for people who set up their own servers. Here is a security evaluation of Clinton’s server by SenderScore:
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