Per user bcc for Zimbra

in /opt/zimbra/postfix/conf, create a file called sender_bcc
and added the user you wanted to copy/send to
employee@domain.com boss@domain.com

in /opt/zimbra/postfix/conf/main.conf, add sender_bcc_maps = hash:/opt/zimbra/postfix/conf/sender_bcc

then run as zimbra user
postmap /opt/zimbra/postfix/conf/sender_bcc

restart postfix –
postfix reload