Manitou-Mail

Main features

Openness of the data: it's all in documented PostgreSQL tables, so third-party programs can access and enrich the mail data in decoded and parsed form.
Sharing of mailboxes between different users at the database level. Users can work concurrently. Users rights can be fine-tuned at the database level.
Separation between user interface and mail system: the user interface is only connected to the database, allowing fine control of permissions and remote access via SSH tunnels or PostgreSQL SSL encryption.
Seamless support for gigabytes mailboxes.
Multi-categorization with hierarchical message tags (labels).
Full indexing of the bodies of messages, integrated search engine.
Fast retrieval, with extended search criteria (authors, subjects, full text search, word search, dates, tags, status, priorities...)
Extended server-side filtering capabilities.
User-written server-side perl plugins that run on pre-analyzed incoming messages, allowing customized filtering or hooks to other programs (antispam, dictionaries, external databases)
Internal user notes on messages.
SQL queries allowed at the user interface level to retrieve lists of messages with complex user-defined criteria. Queries can be elaborated by an admin and reused by non SQL-aware users.
Unicode support (international character sets)
Threading.
Multiple identities.
Browser-like navigation through lists of messages.
X-Face support.

Changelog

Version 0.9.9

Disk usage is now reduced by sharing identical attachments across the whole database, both for incoming and outgoing email, based on their SHA1 fingerprint.

A new script, manitou-mgr, has been added to run batch actions on the database: full-text reindexing, and hashing and merging attachments imported with previous versions.

The user interface now allows easier switch to a temporary identity when composing a message, and deleting messages has been made faster.

Version 0.9.8

The user interface has been ported to Qt4.

Attachments handling has been improved, along with various minor bugfixes.

A GPL'ed Windows version of the user interface is now available, with precompiled binaries.

Debian packages for Linux are now available.

Version 0.9.7

This release offers a revamped full text search engine, a new online help system using Qt assistant, modularized Perl code for the mail-database exchanger, along with a number of small bugfixes and enhancements.

Also, the user interface now compiles on Solaris and BSD-based systems.

Version 0.9.6

This release adds a dozen bugfixes, a French translation for the user interface, a bayesian auto-classifier plugin, an automated FTP uploader for large attachments (converts attachments into URLs), the ability to run Perl plugins on outgoing mail, and various usability enhancements.