vi /etc/postfix/header_checks
/^Received:.*with ESMTPSA/ IGNORE
/^Received:/ IGNORE
/^X-Originating-IP:/ IGNORE
/^X-Mailer:/ IGNORE
/^Mime-Version:/ IGNORE
vi /etc/postfix/main.cf
mime_header_checks = regexp:/etc/postfix/header_checks
header_checks = regexp:/etc/postfix/header_checks
postmap /etc/postfix/header_checks
postfix reload