MailWash
- JavaScript to clean out quoting marks and extra line breaks in e-mail messages.
- http://www.desklampllc.com/op.onza.net/mailwash/

Mail2RDF
- A small tool which checks your inbox and produces a RSS news feed from subjects of unread/unseen mails.
- http://sourceforge.net/projects/mail2rdf

Filtering Mail FAQ
- General filtering strategies and instructions for using procmail, mailagent, and the Elm filter program to filter mailing list messages into separate folders.
- http://ii.best.vwh.net/internet/faqs/launchers/mail/filtering-faq/

MailGoGoGo
- MailGoGoGo prevents unwanted e-mail from reaching an inbox. Available for Macintosh and Windows.
- http://www.makienterprise.com/mailgogogo/mailgogogo.html

NotifyMail Software
- Software to receive a server signal to check for new mail. Available for Macintosh and Windows.
- http://www.notifymail.com

HWG Filtering FAQ (Windows, Mac, Unix)
- The HTML Writers' Guild's FAQ sheet about mail filtering systems (multiple platforms)
- http://www.hwg.org/resources/faqs/filterFAQ.html

Infinite Ink's Robots and Mail Filtering
- A good collection of links about mail robots and e-mail filtering (somewhat slanted towards Unix applications)
- http://www.ii.com/internet/robots/

Picons Archive
- Databases, documentation, sources and sampler for picons, personal icons of users, domains and newsgroups on the net.
- http://www.cs.indiana.edu/picons/ftp/index.html

InterGuru's E-Mail Address Conversions
- Convert e-mail client address books between Netscape, Eudora, Juno, Unix Mail, csv, Pegasus, Pine, Databases, ccMail, Microsoft Internet Mail, Spry, Compuserve, ldif and Elm.
- http://www.interguru.com/mailconv.htm

Faces Archive
- Collected and mirrored sources for software that can use picons databases containing personal icons of users, domains and newsgroups on the net.
- http://www.cs.indiana.edu/ftp/faces/index.html

Smileys
- Small book from O'Reilly.
- http://www.oreilly.com/catalog/smileys/