I've installed Zimbra a few hours ago, and I'm very pleased about it. I've sent out a few test e-mails to see if everything was working well, and I had a look at the e-mail source to see what kind of information was disclosed.
First, let me give you a quick explanation about what my network looks like.
1) My personal network : 192.168.0.0/24
The mail server has the following static IP address: 192.168.0.15
2) The network accesses the Internet through my ISP's router (192.168.0.1). All relevant ports are forwarded to the mail server, so the Zimbra application works fine.
3) I have a static Internet IP address : 85.X.X.X
Now, here is the source of an e-mail sent to a test address :
As you can see, the headers give a certain amount of information about my private network that I'd rather not disclose.
Received: from mail.mydomain.com ([85.X.X.X]) by bay0-mc1-f15.Bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675);
Sat, 5 Feb 2011 08:04:00 -0800
Received: from localhost (localhost [127.0.0.1])
by mail.mydomain.com (Postfix) with ESMTP id 52C9D2E7E123
for <email@example.com>; Sat, 5 Feb 2011 17:03:59 +0100 (CET)
X-Virus-Scanned: amavisd-new at mydomain.com
Received: from mail.mydomain.com ([127.0.0.1])
by localhost (mail.mydomain.com [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id wPI7oyZZaVqc for <firstname.lastname@example.org>;
Sat, 5 Feb 2011 17:03:58 +0100 (CET)
Received: from mail.mydomain.com (mail.mydomain.com [192.168.0.15])
by mail.mydomain.com (Postfix) with ESMTP id BEC552E7E120
for <email@example.com>; Sat, 5 Feb 2011 17:03:58 +0100 (CET)
Date: Sat, 5 Feb 2011 11:03:58 -0500 (EST)
To: Me <firstname.lastname@example.org>
Subject: Hello Zimbra!
Is this a misconfiguration on my part? Is there a way around this?
Thanks in advance for your time.
PS: As a bonus question, I know that it is really not the place to ask about this, but if someone knows the answer, it would be nice to get pointers while I'm at it I have also noticed that Hotmail filters most of the e-mail I send from my personal mail server (all except the replies to mails from Hotmail actually). Is there a way to be whitelisted?