I‘ve central mail server gateway. All of our internal systems through this box. How do I remove or hide the hostnames and IP addresses of our internal systems from the messages headers before they go out to other users for security purpose?
Q. I’ve Postfix based CentOS Linux server. I need to blacklist email ID: firstname.lastname@example.org . How do I blacklist email address with postfix? I also have spamassassin software installed. A. By default, the Postfix SMTP server accepts any sender address. However you can block / blacklist sender email address easily with Postfix. It has SMTP [...]