Write this code in /etc/postfix/header_checks
/^Received:/ IGNORE /^X-PHP-Originating-Script:/ IGNORE /^X-Originating-IP:/ IGNORE /^X-Mailer:/ IGNORE /^Mime-Version:/ IGNORE
IT
Write this code in /etc/postfix/header_checks
/^Received:/ IGNORE /^X-PHP-Originating-Script:/ IGNORE /^X-Originating-IP:/ IGNORE /^X-Mailer:/ IGNORE /^Mime-Version:/ IGNORE