Unspecified vulnerability in SLMail.exe in SLMail Pro 6.3.1.0 and earlier allows remote attackers to cause a denial of service (UDP service outage) via a large packet to UDP port 54. NOTE: some of these details are obtained from third party information.
https://exchange.xforce.ibmcloud.com/vulnerabilities/41533
http://www.vupen.com/english/advisories/2008/1039/references
http://www.securityfocus.com/bid/28505