Already followed the instruction http://www.linuxmail.info/postfix-multiple-ip-address-smtp-greeting/ I want that each time using 1 SMTP to send email, it just shows the information of 1 IP & 1 host name in the email header. Now I see that it always shows the information of Main IP & Main Hostname. Detail in https://docs.google.com/document/d/1aCk7vvbP341FR2kd4zXqDVkZlE_8DArUrT6wlOZoiH0/edit Thank you so much!
