Hello. I'm hosting a mail server that provides mail services for 3
companies. (names and addresses changed to protect the
innocent/guilty) It's like this:
myhostname = www.company1.com
mydomain = company1.com
myorigin = company1.com
mydestination = company1.com, company2.com, company3.com
The actual hostname of the box is www.company1.com, dating back to when
I hosted just the one.
So far this mail server has only ever handled incoming mail - outgoing
mail is sent by their mail clients directly to the ISP's SMTP server.
However, for various reasons I am going to need to begin handling
outgoing traffic for all 3 companies now.
It so happens that this is a multihomed (aliased) server so that they
all have their own publically-routable static IP addresses. e.g.
172.19.201.10 - www.company1.com
172.19.201.11 - www.company2.com
172.19.201.12 - www.company3.com
However, all the outgoing mail appears to come from "www.company1.com"
in the message headers. e.g. when sending from webmail:
------------------------------------------------------------------------
Received: from www.company1.com (www.company1.com [172.19.201.10])
by www.example.net (Postfix) with ESMTP id CB4E03150B0
for <g_adam...@example.com>; Sat, 16 Nov 2013 02:01:58 -0500 (EST)
Received: from localhost (localhost [127.0.0.1])
by www.company1.com (Postfix) with ESMTP id DA30125E289F
for <g_adam...@example.com>; Sat, 16 Nov 2013 02:01:57 -0500 (EST)
------------------------------------------------------------------------
Company2 and Company3 do not want to have references to
www.company1.com in the outgoing mail headers. They want mail to be
going out with their own hostnames (both in the envelope and the From:
headers).
Is there a way to do this? Either through a Postfix change, or forcing
the mail to go through an aliased NIC (eth0:1 or eth0:2) and its
associated hostname rather than eth0 (which is www.company1.com's IP
address)?
Thanks to anyone who can help!
