http://www.gnome.org/projects/evolution The Evolution home page.
http://www.mozilla.org/products/thunderbird The Mozilla Thunderbird page. Links to MozillaZine knowledge base and help forums.
http://pim.kde.org Home of the KDE Personal Information Management suite: Kontact, KMail, Korganizer, and the ancillary tools.
http://sylpheed.good-day.net Sylpheed, the other GTK-based mail client.
http://www.mutt.org The mongrel of text-based email clients.
http://www.fpx.de/fp/Software/UUDeview The UUDeview multiformat file attachment decoder. Works with all encoding formats (BinHex, yEnc, MIME, UUEncode). Enjoy the Introduction to Encoding document and get some useful history, too.
http://www.yenc.org/linux.htm Linux readers and writers for the yEnc coding format.
http://email.about.com/cs/standards/a/base64_encoding.htm An excellent description of Base64 encoding.
http://www.postfix.org/start.html The Postfix home page. Be sure to click the Web Sites link on the menu to find a mirror site close to you.
http://www.seaglass.com/postfix/faq.html The Postfix mailing list FAQ, maintained by Kyle Dent, author of Postfix: The Definitive Guide.
http://www.sendmail.org The Sendmail home page.
http://catb.org/~esr/fetchmail The Fetchmail home page.
http://www.paulgraham.com/spam.html Paul Graham's original essay, "A Plan for Spam," outlines the theory of Bayesian filtering.
http://spamassassin.apache.org SpamAssassin home page. Check out the wiki pages for downloadable custom rulesets.
http://bogofilter.org Eric Raymond's Bogofilter project.
http://www.nidelven-it.no/articles/introduction_to_thunderbird_5 A good introduction to spam filtering with Mozilla Thunderbird.
http://www.iki.fi/era/procmail/mini-faq.html The Procmail FAQ. In his own words, "The author wanted to call this a 'Mini-FAQ' but it keeps getting bigger. There are plans to rename it the 'Bronto-FAQ.'"
http://pm-doc.sourceforge.net The Procmail Documentation Project. See the PM-Tips page for sample rulesets/recipes and many other good ideas.
http://www.clamav.net Home of the open source Clam antivirus program.
