Problems with postfix & bcc

[FireHost1]

I want to archive incoming and outgoing mails.
i found this thread (https://talk.plesk.com/threads/bcc-incoming-outgoing-emails-plesk-11-0-9-postfix.289438/) and added

recipient_bcc_maps = hash:/etc/postfix/bcc_maps
sender_bcc_maps = hash:/etc/postfix/bcc_maps

into my main.cf.
After reloading, nothing happens:

postconf -d |grep bcc
always_bcc =
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $sender_bcc_maps $recipient_bcc_maps $smtp_generic_maps $lmtp_generic_maps $alias_maps
recipient_bcc_maps =
sender_bcc_maps =

https://talk.plesk.com/threads/bcc-incoming-outgoing-emails-plesk-11-0-9-postfix.289438/

Where is the mistake?