====== 1. Create the file ======
 
<cli>
/etc/postfix/recipient_bcc
</cli>

====== 2. Populate it by using the syntax ======
 
existing_address <TAB> <forward_destination_address>

====== 3. Edit "/etc/postfix/main.cf" ======
 and add (I'd suggest at the end)	                
<cli>
recipient_bcc_maps = hash:/etc/postfix/recipient_bcc
</cli>

====== 4. Edit "/etc/postfix/master.cf" ======
 => line 9 (smtp inet) by adding a new line under it with
<cli>
  -o receive_override_options=no_address_mappings
</cli>
# This avoids duplicates when the mail is re-injected. If you don't add it, every BCC is sent twice!

====== 5. Create the .db-File by running ======

<cli>
postmap /etc/postfix/recipient_bcc

</cli>
====== 6. Initialize the new config ======


<cli>
  postfix reload
</cli>
**Each time you add a new BCC you have to run steps 5 and 6**

====== 7. Addendum ======

If is not working (version > 1.0.3) skip step 4 
and in step 3 use:

<cli>
sender_bcc_maps = hash:/etc/postfix/recipient_bcc
</cli>