Secunia Security Advisory – Some vulnerabilities have been reported in MAILsweeper for SMTP/Exchange, which can be exploited by malicious people to bypass certain security restrictions and potentially cause a DoS (Denial of Service).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/47571/sa20756.txt
Source: https://packetstormsecurity.com/files/47571/Secunia-Security-Advisory-20756.html