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Desift is a data-driven, template-based text filter implemented in Perl, ideal for generating scripts, content and reports. It provides powerful formatting capabilities for delimited text/input streams, especially when combined with other shell programs.
Spamscan is a content based spam filter using keywords set by the user it is filtering mail for, and determines (or attempts to anyway) whether the email is spam or not. If it is, it optionally labels the mail (in the Subject: line, it would simply add SP
j-chkmail is a complete solution to mail filtering on busy SMTP gateways - it includes both behavioural filtering (rate limit, greylisting) and content filtering (statistical filtering, URL filtering, pattern matching, heuristics, ...).
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An Apache2 module (filter) which receives standard WHOIS queries and rewrites them into standard HTTP requests. After the "translation", the request can be processed by the usual mechanisms (mapping to static content, running CGI & PHP scripts, ...)
jSense aims to be a totally autonomous contentfilter that analyses pages with XML based filter definitions. Its proxy server base will ultimately have support for many protocols other than HTTP. It utilizes pure java and XML.
Adapted a procmail spam filter for use by maildrop (used by courier mail server). Any identified spam has a header added that marks it as spam and gives a reason. Also converts mime parts of content type text/html into text/plain in suspect e-mails.
OzoneFarm is a eCommunity-building project aimed at promoting open source computing and distribution and generation of open content. The goals and strategies for forming the community are being discussed in an open forum.
Mail Systems, particularly Corporate Mail Spools should provide organisations with the ability to
filtercontent from entering the organisation based on file types (ie - No VBS files), virus scans and
whatever pedantic ideas sysadmins come up with.
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Mailchecker will (in time) check mail for 'safe' content. 'unsafe' content (e.g. attachments that may contain viruses) will be stopped or converted to 'safe' formats.
...If it is necessary to apply one another filter, then the content can be brought back to the Input Area with a simple click on a button. This process is repeated until the expected result is reached.
...It is basically dansguardian rewritten in python as an ICAP server as opposed to a proxy front-end. The benefits of archangel over dansguardian include:
1. Because it is an ICAP filter, it interfaces with squid and can do HTTPS filtering as well as regular HTTP.
2. Because it uses blocking modules and is written in python, it is extremely easy to write new modules for very complex, intensive blocking. I have already written a module that does content-based blocking of youtube videos.
Archangel uses the pyicap library to implement the ICAP functionality. ...
PDFassassin is a module for Spamassassin which scans the content of PDF attachments against the spamassassin engine and appends the resulting spam score to the overall score of the email message.
WebDeco implemens the Decoration Design Pattern for J2EE/JavaEE web applications. It does so by providing a Servlet Filter that wraps a very flexible and extensible framework for content extraction and decoration.