[Feature Request] Provide average user with server-side mail filters and rules through Roundcube

In normal use, FBX does not give the average person tools to create e-mail rules (i.e. out of office replies, forwards etc.) or filters (i.e. folder messages to context) to organize their mail. The average user has to rely on at least one of their email clients or script into postfix/dovecot configurations.

However, with a server-side e-mail client as Roundcube, one can setup these filters and rules without having to depend on individual clients on other devices.

Roundcube can make use of the managesieve plugin to do this. With the plugin installed, users can create their own server-side mail rules and filers through the Roundcube webui. With server-side setup, users then don’t have to depend on other individual clients and can easily apply the rules and filters consistently on all their devices.

Luckily, this plugin is available in the Debian repos [(https://packages.debian.org/source/trixie/roundcube-plugins-extra) and (https://packages.debian.org/trixie/roundcube-plugins)] and can be setup with the following steps:

1. install roundcube plugins

sudo apt update && sudo apt install roundcube-plugins roundcube-plugins-extra

2. edit /etc/roundcube/config.inc.php to add the managesieve plugin as follows

// List of active plugins (in plugins/ directory)
// Debian: install roundcube-plugins first to have any
$config['plugins'] = [
       'managesieve',
    // 'archive',
    // 'zipdownload',
];

3. Copy the generated file into the relevant plugin folder with

sudo cp /usr/share/roundcube/plugins/managesieve/config.inc.php.dist /etc/roundcube/plugins/managesieve/config.inc.php

As I have found that this is also on the “roadmap” for email: Improve app for managing a full mail server setup issue on salsa, I believe it would be a great add if included to the default Roundcube installation on FBX.