Enable BCC Forwarding For All Domain Users # /etc/postfix/main.cf sender_bcc_maps = pcre:/etc/postfix/domain_users_bcc_maps recipient_bcc_maps = pcre:/etc/postfix/domain_users_bcc_maps # /etc/postfix/domain_users_bcc_maps /^(.+)@domain\.tld$/ $1@backup.domain.tld postfix reload