GitHub - teythoon/Roundcube-Plugin-SieveRules-Managesieve: Adds a 'Filters' tab to the 'Personal Settings' to allow the user to manage their Sieve mail rules.
Roundcube Spam Filtering
Servgate.jp - Managing your mailbox settings with Roundcube
Installing a mailserver on Debian 8/9 – Part 8: Quota, rules, aliases and other settings – Vorkbaard uit de toekomst