Perdition is a fully featured POP3 and IMAP4 proxy server. It is able to
handle both SSL and non-SSL connections and redirect users to a
real-server based on a database lookup. Perdition supports modular based
database access. ODBC, MySQL, PostgreSQL, GDBM, POSIX Regular Expression
and NIS modules ship with the distribution. The API for modules is open
allowing abitary modules to be written to allow access to any data store.

Perdition can be used to: Create large mail systems where a users mailbox
may be stored on one of several hosts.  Integrate different mail systems
together. Migrate between different email infastructure. And in firewall
applications.

Homepage:
https://projects.horms.net/projects/perdition/
