You can make alias on multiply addresses and setup a bcc for that alias:
Find or edit bcc_map (or else name) file in /etc/postfix, compile this into a postfix hash file using:
postmap bcc_map
Add tp postfix main.cf config:
sender_bcc_maps = hash:/etc/postfix/bcc_map
Source: linux – Can postfix be set up to forward mail to multiple recipients – Server Fault