Spammers and scammers have used all sorts of tricky subject lines and from addresses to make you want to open unexpected e-mails. One of the latest tricks amounts to scare tactics.

If you receive any unexpected e-mails from the FBI or with FBI.gov in the sender or reply-to field, it's a scam. It's not clear yet whether the attack is a virus, phisher, or just plain spam, but there's some sort of new e-mail scam involving faked FBI headers.

Unless you personally know someone who works for the FBI, there's no reason to open an e-mail claiming to be from them. The FBI does not send unsolicited e-mails to the public.

If you receive one of the new fake FBI emails and would like to help track down the source, you can submit a complaint at: www.ic3.gov . More information about FBI e-scams can be found on the official FBI site.