Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.
Archiveopteryx is a mail server optimised to support high-volume, long-term archival.
It stores mail in a PostgreSQL database, and provides access to it through IMAP, POP, and a webmail interface.
It seeks to make it practical not only to maintain large archives, but to easily organize, search, and access the archived information on a daily basis, instead of relegating it to offline storage.
Archiveopteryx is available both on commercial terms and as open source.