Postfix server for Apple Mac OS X 10.3.6, when using CRAM-MD5, allows remote attackers to send mail without authentication by replaying authentication information.
https://exchange.xforce.ibmcloud.com/vulnerabilities/18353
http://www.securityfocus.com/bid/11802
http://www.ciac.org/ciac/bulletins/p-049.shtml
http://secunia.com/advisories/13362/
http://lists.apple.com/archives/security-announce/2004/Dec/msg00000.html