[postfix-jp: 2562] ｒecipient_delimiter 設定がうまくいかない．

["imak" <imakun@xxxxxxxxxxx>]

はじめまして．

ユーザ固有のＭＬを実現するため，
ｒecipient_delimiter設定を有効にしたいと考え，
main.cfを

ｒecipient_delimiter= + 

と追記したのですが，
どうしてもうまくいきません．症状としては，

１．.forward は，成功する．
２．.forward+test を作成し，ＭＬリストメンバを入力．
３．user+test@example.co.jpに送ったところ，user@example.co.jpに届く．

という状態です．アドバイスいただけますと幸いです．

postconf -nの結果

alias_database = hash:/etc/postfix/aliases
alias_maps = ldap:ldapsource,hash:/etc/postfix/aliases,hash:/var/lib/mailman/data/aliases
allow_mail_to_commands = alias,forward, include
allow_mail_to_files = alias, forward
allow_percent_hack = yes
append_at_myorigin = yes
append_dot_mydomain = yes
biff = no
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/lib/postfix
default_destination_concurrency_limit = 10
default_destination_recipient_limit = 25
default_privs = nobody
disable_vrfy_command = yes
empty_address_recipient = MAILER-DAEMON
fallback_transport = uucp
header_checks = regexp:/etc/postfix/spammers
header_size_limit = 102400
home_mailbox = Maildir/
inet_interfaces = all
initial_destination_concurrency = 3
invalid_hostname_reject_code = 501
line_length_limit = 4096
local_destination_concurrency_limit = 2
local_recipient_maps =
mail_owner = postfix
mailbox_size_limit = 0
maps_rbl_domains = relays.ordb.org
maps_rbl_reject_code = 550
masquerade_exceptions = root
message_size_limit = 1024000000
mydestination = $myhostname, localhost, localhost.$mydomain, www.$mydomain, mail
host.$mydomain, $mydomain
mydomain = example.co.jp
myhostname = smtp.example.co.jp
mynetworks = 127.0.0.0/8, 192.168.*.*/24
mynetworks_style = subnet
myorigin = $mydomain
owner_request_special = no
queue_directory = /var/spool/postfix
recipient_delimiter = +
reject_code = 550
relay_domains_reject_code = 550
relayhost =
relocated_maps = hash:/etc/postfix/relocated
smtpd_banner = $myhostname ESMTP $mail_name
swap_bangpath = yes
unknown_address_reject_code = 450
unknown_client_reject_code = 450
unknown_hostname_reject_code = 450
unknown_local_recipient_reject_code = 550

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