Maybe you've just learned about blacklisting and whitelisting, and now they're talking about greylisting. What's the deal?

Black-, white- and greylisting are all techniques designed to cut down the spam that arrives in your mailbox. A blacklist contains addresses or domains that you don't want to receive mail from, regardless of the message contents. A whitelist, or trusted sender list, specifies those you do want to receive from. Whitelisting is particularly useful when your spam filters are putting legitimate mail into your junk folder.

These two methods have been used for years with varying degrees of success, but the spam problem is still going strong. Enter greylisting. This new technique is being implemented by ISPs in the hope that it will have a bigger impact on cutting spam than blacklisting has.

With greylisting, the mail server will temporarily reject an email coming from an unknown sender. Legitimate mail servers will then resend the message, which your mail server will now accept. Once the sender has been shown to be legitimate, that address will be added to the trusted sender list, and there will be no delay for subsequent emails from that source.

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If you already know the address of the website you want to visit, you can type it into the address box at the top of your web browser instead of going to Google. Easier still, if the address is in an email or other electronic document, you can copy and paste it into the address box. And most of the newer browsers also have an autocomplete feature, so if you have been to the webpage before, you'll see a list of matching addresses as you start typing. As soon as you see the one you want, point to it and click!

There is no such thing as an email tracking program that counts how many times an email is forwarded, nor is it possible for an email to show you a video after you have forwarded it - yet!