A Craigslist harvest tool is used to gather email addresses from the classified site, Craigslist. This tool, also known as an email harvester, is frequently abused by spammers, but there is a legitimate use if there are several ads that a person wants to respond to. They can gather all of the emails in a section, such as the employment ads, so that all the people who placed the ads can be emailed at the same time. The Craigslist harvest tool gathers the temporary emails that are used for each ad. The ad person's real email address isn't known unless they respond to the message sent by the person using the tool.