Multiple buffer overflows in SLMail 5.1.0.4420 allows remote attackers to execute arbitrary code via (1) a long EHLO argument to slmail.exe, (2) a long XTRN argument to slmail.exe, (3) a long string to POPPASSWD, or (4) a long password to the POP3 server.
http://www.nextgenss.com/advisories/slmail-vulns.txt
http://packetstormsecurity.com/files/161526/SLMail-5.1.0.4420-Remote-Code-Execution.html