Archiveopteryx is an Internet mail server,
optimized to support heavy usage and long-term
archiving. It stores mail in a PostgreSQL
database, and provides access to it through IMAP,
POP, and more.
License: Open Software License
Changes:
Notable changes since 2.03 include many important bugfixes and performance enhancements, RRDTool integration for monitoring, Sieve improvements (vacation autoresponses, subaddresses, and date tests), the IMAP SORT extension, and many more parsing fixes for broken mail.