"Have you checked your spam folder?" You've probably heard this question before. But perhaps you weren't quite sure what your spam folder even is, never mind how to check it. What is a spam folder?

eWEEK content and product recommendations are editorially independent. We may make money when you click on links to our partners. Learn More. There are many measures of a spam-blocking product, but ...

Most of these are spam, but at least one definitely isn’t. Before I incur the wrath of non-Gmail users, let me just note that this tip also applies to Hotmail, Outlook.com, Yahoo, and so on. But ...

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