The camel component for Ximian Evolution 1.0.x and earlier does not verify certificates when it establishes a new SSL connection after previously verifying a certificate, which could allow remote attackers to monitor or modify sessions via a man-in-the-middle attack.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2002-1454
http://www.securityfocus.com/bid/5875
http://www.iss.net/security_center/static/10292.php
http://archives.neohapsis.com/archives/bugtraq/2002-10/0045.html