Unspecified vulnerability in (1) pop3d, (2) pop3ds, (3) imapd, and (4) imapds in IBM AIX 5.3.0 has unspecified impact and attack vectors, involving an "authentication vulnerability."
https://exchange.xforce.ibmcloud.com/vulnerabilities/31875
http://www.vupen.com/english/advisories/2007/0382
http://www.securityfocus.com/bid/22262
http://www-1.ibm.com/support/search.wss?rs=0&q=IY93084&apar=only