Corsaire Security Advisory – Clearswift MAILsweeper versions prior to 4.3.15 do not detect a number of common compression formats, for which it is listed as compatible, and in certain circumstances also fails to identify the name of file attachments when they are encoded.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34048/c030807-001.txt
Source: https://packetstormsecurity.com/files/34048/Corsaire-Security-Advisory-2003-08-07.1.html