Most people are familiar with autoresponders that send out those automated "I'm away" or "I'm on vacation" messages. In fact, most web hosting and email providers refer to these autoresponders as "away" or "vacation" settings within their email programs. These are good for a quick one shot automated reply to let someone know that you got their message or that you are away and will be returning to reply later.
Read the full article "What is an AutoResponder? Do I Really Need One?"