Router:
sieve:
  driver = redirect
  allow_fail
  user = www-data
  check_ancestor
  group = www-data
  file = /var/local/squirrelmail/data/$local_part@$domain.sievesource
  sieve_vacation_directory=$home/.sieve_vacation_db
  no_verify
  no_expn
  owners = www-data
  owngroups = www-data
  headers_add = ${if >{$spam_score_int}{${lookup mysql{select users.sa_tag * 10 from users,domains \
        where localpart = '${quote_mysql:$local_part}' \
        and domain = '${quote_mysql:$domain}' \
        and users.on_spamassassin = '1' \
        and users.domain_id=domains.domain_id }{$value}fail}} {X-Spam-Flag: YES\n}{} }
  headers_remove = ${if or { { <{$spam_score_int}{1} } \
                             { <{$spam_score_int}{${lookup mysql{select users.sa_tag * 10 from users,domains \
                       where localpart = '${quote_mysql:$local_part}' \
                       and domain = '${quote_mysql:$domain}' \
                       and users.on_spamassassin = 1 \
                       and users.domain_id=domains.domain_id}{$value}fail}} } \
                     { eq {0}{${lookup mysql{select users.sa_tag * 10 from users,domains \
                       where localpart = '${quote_mysql:$local_part}' \
                       and domain = '${quote_mysql:$domain}' \
                       and users.on_spamassassin = 0 \
                       and users.domain_id=domains.domain_id}{$value}fail}}} \
                   } {X-Spam-Score:X-Spam-Report} }
  local_part_suffix = -*
  local_part_suffix_optional
  retry_use_local_part
  pipe_transport = address_pipe
  reply_transport = address_reply
  file_transport = sieve_transport
  allow_filter = true