90-sieve.conf

plugin {

  sieve_plugins = sieve_imapsieve sieve_extprograms

  sieve = /var/mail/vhosts/%d/%n/.dovecot.sieve
  sieve_default = /var/mail/sieve/default.sieve
  sieve_after = /var/mail/sieve/default.sieve
  sieve_dir = /var/mail/vhosts/%d/%n/sieve
  sieve_global = /var/mail/sieve
  sieve_max_script_size = 1M
  sieve_quota_max_scripts = 0
  sieve_quota_max_storage = 0
  sieve_pipe_bin_dir = /etc/dovecot/sieve
  sieve_global_extensions = +vnd.dovecot.pipe

  # From elsewhere to Spam folder
  imapsieve_mailbox1_name = INBOX.Spam
  imapsieve_mailbox1_causes = COPY
  imapsieve_mailbox1_before = file:/etc/dovecot/sieve/report-spam.sieve

  # From Spam folder to elsewhere
  imapsieve_mailbox2_name = *
  imapsieve_mailbox2_from = INBOX.Spam
  imapsieve_mailbox2_causes = COPY
  imapsieve_mailbox2_before = file:/etc/dovecot/sieve/report-ham.sieve

}