Although the link below looks real, always, if you feel the email is real, go to your browser, go to the real website and log in from there to see if there are any messages. No site would send this kind of email, it will always be fake.
From: Craigslist <email@example.com>
Date: Wed, Jan 12, 2011 at 1:41 PM
Subject: craigslist.org Request to Reset Account
To: Craigslist <firstname.lastname@example.org>
Dear Valued Member of Craigslist
Due our recently updates on our website we need you to confirm again
your account details by clicking on the "verify my account" details link below :
https://accounts.craigslist.org/ (actual link removed)
Failure to do this will lead to restricted access to your account.
We apologize for the inconvenience but we want to provide you the best services.
- Craigslist Support Department