Early termination vulnerability in the IMAP service in E-Post Mail 4.05 and SPA-PRO Mail 4.05 allows remote attackers to cause a denial of service (infinite loop) by sending an APPEND command and disconnecting before the expected amount of data is sent.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24341
http://www.vupen.com/english/advisories/2006/0318
http://www.securityfocus.com/bid/16379