GLD-fork is a fork of the GLD program by Salim Gasmi. The fork has been made because the original project has been dead for many years, and some new featured were needed. GLD-fork, as with the original GLD, adds greylisting functionality to the Postfix mail server. Greylisting is a fairly resource friendly anti-spam technique. GLD-fork can easily be combined with other (more resource consuming) tools to build anti-spam protection.
SSID-based SMTP server changer for Evolution is a simple script that uses gconf and NetworkManager (via D-Bus) to check which wireless network (SSID) you are currently connected to, and updates Evolution's accounts list (in gconf) to point to the correct SMTP server for that network. It is useful for when roaming between wireless networks that are connected to different ISPs.
BarricadeMX provides very accurate, high performance spam and virus protection for Enterprise and ISP sites. Features include simple installation and administration, little if any end user interaction required, no quarrantine required, and an optional custom non-delivery receipt for all rejected messages. It uses a custom version of SpamAssassin along with many proprietary anti-spam techniques to achieve a guaranteed level of over 99% accurate spam detection with fewer than 0.1% false positives.
OpenFWTK is an application proxy toolkit which inherits the ideology of TIS fwtk and maintains API backwards compatibility. The design goal is to make it simple yet powerful; no performance hacks are allowed in the code and library dependencies are reduced to a minimum. It is a true application layer filter. It features unified pluggable content inspection for the most frequently used protocols, NAC (Network Admission Control), and the ability to define fine-grained Internet access policy based on browser identification.
fdm (fetch and deliver mail) is a simple, lightweight replacement for mail fetching, filtering, and delivery programs such as fetchmail and procmail. It can fetch using POP3, POP3S, IMAP, IMAPS, or stdin, and deliver to a pipe, file, maildir, mbox, or SMTP server, based on a set of regexps. It can be used for both single user and multiuser setups, and is designed with privilege separation when running as root.
Sendmail Sender Address Validator is a lightweight, fast, and reliable Sendmail milter that implements a real-time Sender email Address Verification technology. This can stop some kinds of spam with a spoofed sender's email address. It also implements real-time Recipient email Address Verification, which can be useful if your machine is a backup MX for the recipient's domains, or if your machine forwards all email messages as a relay host for your domains to another internal or external email servers. It is a light alternative for the spamilter, milter-sender, and milter-ahead milters.