How I can backup incoming and outoging mail to another account?

All incoming and outgoing e-mail must be backup with another account

with outgoing email I add this line to main.cf

always_bcc = myuser@domaion , and all outgoing e-mail has backup with this account, and i find recipient_bcc_maps to incoming mail , but isn't working

cat main.cf
recipient_bcc_maps = hash:/etc/postfix/recipient_bcc_maps

cat recipient_bcc_maps
@domain1 user@domain1
@domain2 user@domain1

In logs i don't see any error

Any ideas?