With PDF type of spam, a junk email is sent out with a PDF file attachment, which most anti-spam filters cannot or do not read. These attachments range from rudimentary to professional-looking documents. The text in the body of the email is usually nonsensical gobbledygook that the spam-filter does not recognize as junk mail.

The advent and decline of the different types of spam attest to the cat-and-mouse game that goes on between the spammers and the security experts. As anti-spam technology catches up to their techniques, they continue to innovate and change tactics to deliver their spam messages.

Protecting Your Children

Spam is commercial email that is sent out in bulk to millions of people without their consent. It is may contain advertising messages for regular products and services but increasingly, it is email of an inappropriate, offensive or malicious nature.

Spam Blocker - Your email service may come with a spam blocker. If it does not, it may be worth your while to invest in one for your child's computer. Where-as your email filter filters incoming email into folders, the spam blocker blocks spam from going through the system. It checks your mail server every 10 minutes, where it deletes the spam and destroys any viruses it finds. Legitimate email is let on the server and downloads to the inbox when you log in.

Web beacons: A web beacon, also called an "invisible GIF," is an image sent out with spam that is invisible to the recipient. When the email is opened, the spammer will be alerted that your email address is "live."

Using your email spam filter, you can set up a rule that will ensure that a copy of every email that is sent and received on your child's account is forwarded to your own email address