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{{SpamAssassin/TOC}}
This appendix lists useful online resources for further information about spam, spam-filtering, SpamAssassin, each of the mail transport agents discussed in this book, and several other SpamAssassin-related software packages.

== General Spam Resources ==

"Help! I've been spammed! What do I do?"—originally written by Chris Lewis and maintained by Greg Byshenk—is an helpful (if dated) guide to spam and spam-prevention for the beginner. Find it at ''http://www.byshenk.net/ive.been.spammed.html''.

Internet Request For Comments (RFC) documents describe proposed standards for the Internet. You can get RFCs from ''http://www.rfc-editor.org''. Some notable RFCs related to spam and spam filtering include

;''RFC 2822: Internet Message Format''
: The basic document that describes the formatting of email messages.
;''RFC 2821: Simple Mail Transfer Protocol''
: Explains SMTP, the protocol used to transfer email from system to system.
;''RFC 2505: Anti-spam Recommendations for Internet MTAs''
: Describes a set of best practices for mail servers.

The SPAM-L FAQ, maintained by Doug Muth at ''http://www.claws-and-paws.com/spam-l/'', provides information about the ''SPAM-L'' mailing list, one of the oldest discussion forums for spam fighters.

''http://spam.abuse.net'' is a long-standing site with information for antispam advocates and system adminstrators.

The Coalition Against Unsolicited Commercial Email (CAUCE) has a web site at ''http://www.cauce.org''. CAUCE focuses primarily on advocacy and legislation.

The groups in the ''news.admin.net-abuse'' Usenet hierarchy are devoted to discussing and reporting Net abuse, including spam (see particularly ''news.admin.net-abuse.email'').

== Spam-Filtering ==

''http://www.openrbl.org'' provides a long list of DNSBLs that may be suitable for spam-filtering. It includes hit rates (but not false positive rates) against its own recently collected spam corpus for each DNSBL.

Vipul's Razor, Pyzor, and DCC are collaborative spam-filtering clearinghouses that can be consulted by SpamAssassin. Vipul's Razor is available at ''http://razor.sourceforge.net''. Pyzor is at ''http://pyzor.sourceforge.net''. DCC is at ''http://www.rhyolite.com/anti-spam/dcc/''.

DSPAM is a spam-filtering system using statistical-algorithmic hybrid filtering—filters that are trained like SpamAssassin's Bayesian classifier. Find it at ''http://www.nuclearelephant.com/projects/dspam/''.

CRM114, the Controllable Regex Multilator, is a spam-filtering system based on learning regular expressions. Download it at ''http://crm114.sourceforge.net/''.

== SpamAssassin ==

The home page for SpamAssassin itself is, of course, ''http://www.spamassassin.org''. The site contains links to the ''spamassassin-users'' and ''spamassassin-dev'' mailing lists.

SAProxy Pro, a commercial client-side SpamAssassin proxy, is available from ''http://www.statalabs.com''.

== Mail Transport Agents ==

In this book, I describe how to use SpamAssassin in conjunction with several MTAs. The following sections point you to more information about each of those agents.

=== Sendmail ===

Sendmail has two primary web sites. The open source version maintained by the Sendmail consortium can be found at ''http://www.sendmail.org''. Sendmail's commercial face is ''http://www.sendmail.com''.

Sendmail's own antispam provisions are documented at ''http://www.sendmail.org/m4/anti_spam.html''. If you're not a Sendmail guru, pick up Bryan Costales' book ''Sendmail'' (O'Reilly), the Sendmail bible. If you are a Sendmail guru, you probably already have a copy! Another good source is Frederick Avolio and Paul Vixie's ''Sendmail: Theory and Practice'' (Digital Press).

Sendmail's filtering architecture, milter, has led to the development of many filtering tools. The web site ''http://www.milter.org'' is the most comprehensive catalog of such filters.

=== Postfix ===

The home page for the Postfix MTA is ''http://www.postfix.org''.

Two useful manuals for Postfix are ''Postfix: The Definitive Guide'' by Kyle Dent (O'Reilly) and ''The Book of Postfix'' by Ralf Hildebrandt and Patrick Koetter (No Starch Press).

=== qmail ===

The home page for the qmail MTA is ''http://www.qmail.org''. The netqmail distribution of qmail includes the QMAILQUEUE patch, which is used by most SpamAssassin-integration solutions.

The online book ''Life with qmail'' (''http://www.lifewithqmail.org'') provides excellent documentation for qmail.

=== Exim ===

The home page for the Exim MTA is ''http://www.exim.org''. The site includes a link to the Exim specification, which serves as the manual for the MTA. Those preferring a real book should purchase Philip Hazel's ''The Exim SMTP Mail Server: Official Guide for Release 4'' (UIT Cambridge).

== Related Mail Tools ==

The following sections point to information about various other mail tools mentioned in this book.

=== procmail ===

procmail is a popular and powerful Unix filtering program that acts as a full-featured local email delivery agent. It's available at ''http://www.procmail.org''.

=== MIMEDefang ===

MIMEDefang is a Sendmail milter application written in Perl that provides a framework for mail content scanning, including virus-scanning, spam-checking with SpamAssassin, and MIME validation. It's available at ''http://www.mimedefang.org''. Versions after 2.42 support SpamAssassin 3.0.

=== amavisd-new ===

amavisd-new is a high-performance daemonized content scanner, designed for use with Postfix, but it also supports Sendmail (including a milter version) and Exim. It's available at ''http://www.ijs.si/software/amavisd/''. Don't confuse amavisd-new with amavis, amavis-perl, amavisd, or amavis-ng, all of which are other content scanners, most not actively in development, that now share little code in common with amavisd-new.

=== sa-exim ===

sa-exim is a ''local_scan.c'' replacement for Exim that provides SpamAssassin message-scanning during a SMTP transaction. It offers many options for how to handle spam that it detects, including teergrubing. sa-exim's home page is ''http://marc.merlins.org/linux/exim/sa.html''.

=== exiscan-acl ===

exiscan-acl is a patch for Exim 4 that adds new content-scanning ACL directives to Exim. These directives can be used to invoke SpamAssassin on messages during a SMTP transaction. Some prepackaged Exim distributions already have this patch added. You can download it at ''http://duncanthrax.net/exiscan-acl/''.

=== qmail-scanner ===

qmail-scanner is a content scanner for qmail that can run SpamAssassin on messages early in the delivery process. It contains its own implementation of <tt>spamc</tt> for faster checking. Find it at ''http://qmail-scanner.sourceforge.net''.

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