That's a bad idea: Many personal email services do not offer the same sort of protection against malware and phishing that employees get at work.

WSJ: What's a Company's Biggest Security Risk? You.

This year saw the widespread adoption of a tactic for hiding malware delivery sites known as "fast flux, " says Laura Mather, a researcher at the Anti-Phishing Working Group committee and a senior scientist with digital brand protection firm MarkMonitor.

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The rise of social networks, for example, has aided an increasingly common kind of attack known as spear-phishing, says Greg Bell, global service leader for KPMG's information protection practice.

WSJ: Tech Companies Struggle to Keep Hackers at Bay