How does it work?

You can choose to anonymize your email address when posting to craigslist.

If you select this option, the posting will display a craigslist email address similar to one of the following, instead of your actual email address:

craigslist will then relay any messages sent to that address to your  email address. Once your posting expires off the site or is deleted, messages will no longer be relayed.

Why should I choose to anonymize my email address?