Every day, you receive dozens of email messages, including spam, which is usually harmless, unless there’s a malware attached to it. But even the harmless ones can become more than just an annoyance if you have thousands of them flooding your inbox.

Cybercriminals are fairly experienced at avoiding detection. By the time you notice they’ve infected your computer with malware or hijacked your account, serious damage has most likely already been done. To make matters worse, they have another way to hide their illegal activities, and it involves sending thousands of spam emails.