The pop3 Proxy in Astaro Security Gateway (ASG) 7 does not perform virus scanning of attachments that exceed the maximum attachment size, and passes these attachments, which allows remote attackers to bypass this scanning via a large attachment.
https://exchange.xforce.ibmcloud.com/vulnerabilities/35827
http://www.securitytracker.com/id?1018543
http://www.securityfocus.com/archive/1/477120/100/0/threaded
http://www.securityfocus.com/archive/1/475642/100/0/threaded