Email Security through Procmail (the Procmail Sanitizer) provides methods to sanitize email, removing obvious exploit attempts and disabling the channels through which exploits are delivered. Facilities for detecting and blocking Trojan Horse exploits and worms are also provided.
FileType is a file type detection engine written in C. It will appeal to coders looking for functionality similar to that provided by the 'file' command. FileType is compact (less than 20K binary), efficient, and very portable. FileType is part of the family of software created from the commercial Xamime email filtering project.
GreyList Sendmail milter is a lightweight, fast, and reliable Sendmail milter that implements the Greylisting antispam technology. It has a flexible configuration and a very effective Greylisting algorithm on the base of this tuple: sender's IP address (Class C subnet), envelope sender address, and envelope recipient address. It's a light alternative to the milter-greylist, graymilter, and milter-gris milters.
MailCorral is a robust, high-performance virus/spam filter program that runs as part of sendmail using the milter interface. It handles all currently known malicious attachment types including HTML. It can be left running unattended, removing harmful attachments and notifying recipients by inserting text into processed messages. A backup copy of the original message is also kept for a fixed length of time. Spam identification is accomplished through connections to popular spam recognition packages.
MailScanner is an email virus scanner, vulnerability protector, and spam tagger. It supports the Postfix, Sendmail, Exim, Qmail, and ZMailer MTAs, and the Sophos, McAfee, F-Prot, F-Secure, CommandAV, InoculateIT, Inoculan, eTrust, Kaspersky, Nod32, AntiVir, BitDefender, RAV, Panda, DrWeb, ClamAV, and other anti-virus scanners. It uses SpamAssassin for highly successful spam identification, and is designed to handle denial of service attacks. It will detect password-protected zip files and apply filename checking to their contents. It is very easy to install, requires no changes at all to your sendmail.cf file, is designed to be lightweight, and won't grind your mail system to a halt with its load. It can be integrated into any email system, regardless of the software in use.
MailStripper Pro is a mail scanner that aims to remove spam and viruses from incoming mail. It recognises and decodes many obfuscation techniques used by spammers and uses several different mechanisms to recognise spam which are immune to Bayes poisoning, and has achieved real-world success of over 99.8%. It is MTA-independent and does not implant itself into your mail server. Instead, it functions as a proxy, allowing the MTA to reside on a different server.
The Multivalent PDF Tools is a suite of tools for manipulating PDF documents. It includes tools for compressing, uncompressing (for hand editing), obtaining metadata, splitting and merging, encrypting and decrypting, validating, imposition (aka n-up), making page images, extracting text, and full-text indexing (with Lucene). The compress tool shrinks the PDF 1.5 Reference from 13.5MB to 8MB in PDF 1.5/Acrobat 6 format and down to 5.1MB in a new proposed "Compact" format.