If you’re a Mac user and had Michael Tsai’s SpamSieve installed, you likely weren’t affected by the latest e-mail trojan masquerading as a video clip. Our own computers registered 15 of these messages stopped by the spam filter.

Unlike many computer techs, I won’t say “don’t open e-mail attachments.” But I’m tempted to. I suppose I could say, “Don’t open e-mail attachments unless you know exactly what it is and the person that sent it to you told you in a separate conversation that it was coming.” If so, you can probably rest assured that it’s not a virus or spyware that will not only infect your computer, but also begin attacking other computers.

No matter how well you’re protected, your behavior can compromise your computer’s safety. Safe computing begins with you, not your computer.