Horde is both an Open Source software project and an application framework written in PHP.
The application framework is currently the basis for 50 applications written by developers from around the world, including the flagship IMP Webmail client, the popular Chora repository viewer, and a complete
... [More] groupware suite. The guiding principles of the Horde Project are to create solid standard-based applications using intelligent object oriented design, and wide-ranging platform and backend support. There is great emphasis on making Horde as friendly to non-English speakers as possible. The Horde Framework currently supports many localization features such as unicode and right-to-left text, and is shipped with translations in over 40 languages. [Less]
Mailvisa is a spam filter along the lines of Paul Graham's "A Plan for Spam". It classifies messages by comparing the words in them to known spam words. CPU usage, filtering speed, and filtering accuracy are comparable to other Bayesian filters. Mailvisa was originally intended as a platform for
... [More] experimentation with different filtering parameters, but it has evolved into a useful spam classifier. [Less]
Jaro Mail is an integrated suite of interoperable tools to manage e-mail communication in a private and efficient way, without relying too much on on-line services, in fact encouraging users to store their email locally.
Rather than reinventing the wheel, this suite reuses existing free and open
... [More] source tools and protocols and is mainly targeted for GNU/Linux/BSD desktop usage.
• Targets intensive usage of mailinglists
• Integrates addressbook and whitelisting
• Generates Procmail and Sieve filters
• Encrypts password storage (keyrings)
• Provides advanced Maildir tools
• Defers connections for off-line operations
• Checks SSL certificates over (imap, smtp)
• Supports strong encryption (GnuPG)
• Old school, used by its author for the past 10 years [Less]