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Perdition is a mail retrieval proxy that allows users to connect to a
content-free POP3 or IMAP4 server that will redirect them to their real
POP3 or IMAP4 server. This enables mail retrieval for a domain to be
split across multiple backend servers on a per user basis. It can also
be used as a POP3 or IMAP4 proxy in firewall applications.
Perdition supports arbitrary library based map access to determine the
server for each user - POSIX regex, GDBM, PostgreSQL, MySQL, NIS and
OpenLDAP libraries ship with the distribution.
The use of perditon to scale mail services beyond a single box is discussed
in a paper the author wrote on high capacity email, so be sure to check the
web page.
WWW: http://www.vergenet.net/linux/perdition/
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