This plugin adds support to Roundcube to send the user's original IP (from REMOTE_ADDR) to the mail server using the IMAP ID extension. Some mail servers can log this instead of the web server's address. To use with Dovecot, just enable the plugin in Roundcube's config.inc.php and add the web server's address to "login_trusted_networks" in ${SYSCONFDIR}/dovecot/dovecot.conf.
WWW: https://github.com/corbosman/dovecot_ident
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