I want to create a rule that forwards all mail with a specific sender to another email address.
From what I can tell, this might be possible with sender_bcc_maps but I can't find any examples using a specific address, only domain matches.. additionally, the user does not exist in postfix, this is simply an outbound relay server (on a static IP, in a datacenter) for another Exchange server (on a dynamic ip, in an office).
Ended up adding to main.cf:
and then /etc/postfix/outcopy:
then ran:
and it is working.