cgirard [1] filed a deletion request for roundcube-plugin-sieverules [2]: As stated by the old maintainer this is no longer maintained [1] and replaced by managesieve core plugin [2] [1] https://plugins.roundcube.net/packages/johndoh/sieverules [2] https://github.com/roundcube/roundcubemail/tree/master/plugins/managesieve
[1] https://aur.archlinux.org/account/cgirard/ [2] https://aur.archlinux.org/pkgbase/roundcube-plugin-sieverules/
