I have a CentOS 5.4 box, running ISPConfig 3. I have about 5 additional IPs configured on this server. I have all the IPs configured in ISPConfig (not that it applies to the problem at hand) and have 2 sites setup through ISPConfig. domain1.com and domain2.com domain1.com hosts the nameservers for domain2.com domain1.com points to the primary IP - lets call it 123.123.123.1 domain2.com points to a secondary IP - lets call it 123.123.123.2 When I use PHP mail() to send an e-mail from domain2.com, my "Received From:" header shows the primary IP (123.123.123.1) instead of the IP assigned to domain2.com (123.123.123.2) My question is, how do I get postfix to sign the outbound e-mails from sendmail.postfix as the triggering domain? (In this instance, domain2.com or 123.123.123.2) I know that I can modify ALL outbound headers with /etc/postfix/main.cf and changing $myhostname, but I want the header to be marked with the triggering domain's assigned IP or hostname (either would suffice).
These links might help: http://www.linuxmail.info/postfix-multiple-ip-address-smtp-greeting/ http://www.jpuddy.net/2008/05/19/how-to-email-from-specific-ips-using-linux-and-postfix/
