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We are using cyrus imap version 2.1.17, thus you need to install the following packages:
cyrus21-imapd
cyrus21-pop3d
cyrus21-admin
cyrus21-client
cyrus21-common
cyrus21-doc (is optional but highly recommended)
To manage user accounts, install the mailadmin package (you can get the debianized version from the Sudora private repository, or download the tarball and manually install from the SF site [ http://mailadmin.sf.net/ ]). This program requires PostgreSQL, PHP (with register_global on) and apache-ssl (highly recommended for security purposes).
lmtp should be used to make the final e-mail delivery from postfix into the cyrus mail system.
sieve is a server side mail filtering capability (similiar to procmail) that cyrus implements. The smartsieve package will need to be installed to allow the user to manage their sieve rules via a web interface. sieve is only usable when you retrieve your e-mail via imap, since pop3 does not support sub-folders.