FDP (Four-Dimensional Pocket) project develops the repository which can browse mass information with various viewpoints, and can take out information needed at will. Implementation of the beginning of FDP is MUA (email repository).
FDP Mail Repository is MUA, and is implementation of the beginning of FDP. It enables the accumulation over a long time, and browsing from various viewpoints without a complicated operation by a user.
For permanent storage of a lot of mail, FDP mailer does not change each mail with origin, but keeps it as a respectively individual file (it is MH like). The reason for not keeping mail in an original form is a lifetime of mail data is longer than a mailer. And the reason which is not made a single file is for merely losing no data by the accident once. As a result, FDP mailer has the good feature of not barring the change to other mailers.
Although the classification based on mechanical conditions is performed now, it enables it to also perform the classification which applied the technique of natural language processing in the future (FDP expects becoming the place which tries the new technique of natural language processing).