all@mydomain.com:    foo@mydomain.com, bar@mydomain.com ...

:0 Wh: msgid.lock
| formail -D 8192 ~/.procmail/msgid.cache

plugin {
  sieve = ~/.dovecot.sieve
  sieve_dir = ~/sieve

  sieve_before = /mnt/mail/users/global_sieve/deduplicate.sieve
  # sieve_before2 = /mnt/mail/users/global_sieve/antispam.sieve

  sieve_extensions = +vnd.dovecot.duplicate  # for dovecot < 2.2.18
  #sieve_extensions = +duplicate             # for dovecot >= 2.2.18
}

require "vnd.dovecot.duplicate"; # for dovecot < 2.2.18
# require "duplicate";           # for dovecot >= 2.2.18

if duplicate {
    discard;
    stop;
}

enable_original_recipient=no