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Vipul's Razor is a distributed, collaborative, spam detection and filtering network. Razor establishes a distributed and constantly updating catalogue of spam in propagation. This catalogue is used by clients to filter out known spam. On receiving a spam, a Razor Reporting Agent (run by an end-user or a troll box) calculates and submits a 20-character unique identification of the spam (a SHA Digest) to its closest Razor Catalogue Server. The Catalogue Server echos this signature to other trusted servers after storing it in its database. Prior to manual processing or transport-level reception, Razor Filtering Agents (end-users and MTAs) check their incoming mail against a Catalogue Server and filter out or deny transport in case of a signature match. Catalogued spam, once identified and reported by a Reporting Agent, can be blocked out by the rest of the Filtering Agents on the network.

renattach is a fast and efficient e-mail stream filter written by Jem Berkes. It can rename or delete potentially dangerous attachments or even eliminate entire messages to help sites deal with resource strains caused by virus floods. Unlike conventional virus scanners, there are no specific virus or worm definitions. Instead, attachments are classified based on file extension and executable encoded body content. Features - Fast, efficient, lightweight, little overhead, pure C code - Recognizes both MIME and uuencoded attachments - Compliant with RFC2047 and RFC2231, handles encoded filenames - Capable of reading filenames inside ZIP archives, on the fly - Can rename or delete attachments, or kill entire messages - Can detect executables that carry DOS/Windows signature - Supports list of banned filenames (great for handling floods) - Simple pipe/stream operation; can be used within many filtering systems - Can be used directly as a content_filter for Postfix MTA - Can be installed as a local delivery agent for Sendmail MTA

QPDF is a program that can be used to linearize (web-optimize), encrypt (password-protect), decrypt, and inspect PDF files from the command-line. It does these and other structural, content-preserving transformations on PDF files, reading a PDF file as input and creating a new one as output. It also provides many useful capabilities to developers of PDF-producing software or for people who just want to look at the innards of a PDF file to learn more about how they work. QPDF understands PDF files that use compressed object streams (supported by newer PDF applications) and can convert such files into those that can be read with older viewers. It can also be used for checking PDF files for structural errors, inspecting stream contents, or extracting objects from PDF files. QPDF is not PDF content creation or viewing software -- it does not have the capability to create PDF files from scratch or to display PDF files.

This program is a very basic interface to Paul Vixie's RBL filter. The basic idea of the filter is that when someone is blacklisted for an email abuse, a new domain name is resolved in the form of "a.b.c.d.rbl.maps.vix.com", where "a.b.c.d" is actually the IP address "d.c.b.a". For example, if the IP address 127.0.0.2 were listed as a blacklisted address, "2.0.0.127.rbl.maps.vix.com" would have a DNS entry (this is a real example; that address is in place as a verification mechanism). For more information about the RBL blacklist, please take a look at http://maps.vix.com/rbl/ . For more information about BIND, drop by http://www.isc.org/bind.html . The official home page for rblcheck is at http://www.xnet.com/~emarshal/rblcheck/ . Any ideas, bugfixes, or porting notes should be sent to me at "emarshal@logic.net". Don't bug the MAPS people about this; they didn't write it, and probably wouldn't like getting a bunch of mail about it.

Muttprint pretty-prints mail messages for any mail client which can output plain text with the mail headers included. It uses the typesetting system LaTeX, which is normally installed on a Unix/Linux system.

Notmuch - thread-based email index, search and tagging.

Active Spam Killer (ASK) protects your email account against spam by confirming the sender's email address before actual delivery takes place. The confirmation happens by means of a "confirmation message" that is automatically sent to all "unknown" users.

What can alterMIME do? - Insert disclaimers - Insert arbitary X-headers - Modify existing headers - Remove attachments based on filename or content-type - Replace attachments based on filename For using with postfix see: http://www.paw.co.za/docs/howtos/postfix-altermime/postfix-altermime-howto.html

Greyfix is the greylisting policy daemon for Postfix written by Kim Minh Kaplan. Greyfix uses Postfix policy mechanism to enable greylisting with Postfix.

This package is an implementation of BATV (Bounce Address Tag Validation), a draft proposal for detecting and messages making fraudulent use of a sender address. The filter is written as a plugin to Sendmail or other filters using the milter API.