...
Create /etc/postfix/header_checks (discussed below) then run these commands
cd /etc/postfix
postmap header_checks
postconf -e 'smtp_header_checks = regexp:/etc/postfix/header_checks'
/etc/init.d/postfix reload
...
...
Create /etc/postfix/header_checks (discussed below) then run these commands
cd /etc/postfix
postmap header_checks
postconf -e 'smtp_header_checks = regexp:/etc/postfix/header_checks'
/etc/init.d/postfix reload
...