MailEnable Professional 3.5.2 and Enterprise 3.52 allow remote attackers to cause a denial of service (crash) via multiple IMAP connection requests to the same folder.
https://exchange.xforce.ibmcloud.com/vulnerabilities/44136
http://www.vupen.com/english/advisories/2008/2287
http://www.securitytracker.com/id?1020610
http://www.securityfocus.com/bid/30498