Sender Dependent Outgoing IP Address (Virtualmin) Introduction to Outgoing IPs By default, when your mail server sends out email the SMTP connection will come from the system's default IP address, typically that assigned to. eth0 Even if the email is from a domain that has its own private IP, that address will not be used when sending an email. This behavior can be changed on systems running Postfix version 2.7 and Virtualmin 3.94 or later so that outgoing email from a domain with a private IP address appears to come from that address. This can be useful for separating email from multiple domains as seen by other mail servers, or for setting up per-domain reverse DNS records. Initial Configuration This feature requires Postfix 2.7 (seen on most modern Linux distributions), Virtualmin 3.93 and ideally Webmin 1.600. The steps to set it up are as follows: SSH into the system as, root and edit the /etc/postfix/main.cf file. Look for a line starting with. sender...
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