https://doc.dovecot.org/main/core/config/sieve/managesieve.html
ManageSieve | Dovecot CE
Dovecot CE Documentation
dovecot cemanagesieve
https://rubygems.org/gems/ruby-managesieve/versions/0.4.0
ruby-managesieve | RubyGems.org | your community gem host
your communityrubymanagesievegemhost