postconf -e "always_bcc = special_user@mydomain.tld"

always_bcc (default: empty)

Optional address that receives a "blind carbon copy" of each message that is received by the Postfix mail system.

Note: if mail to the BCC address bounces it will be returned to the sender.

Note: automatic BCC recipients are produced only for new mail. To avoid mailer loops, automatic BCC recipients are not generated after Postfix forwards mail internally, or after Postfix generates mail itself.

i dont want like that,
i want that the software itself should save it inside it.

call it like advance logs