On 12/4/2014 2:20 PM, Martin Vegter wrote:
When I send email via my Postfix, the header actually contains the IP
address of my laptop. Such as 192.168.1.113 [12.34.56.78]) in the
example below:
Received: from mail.origin.com (mail.origin.com [65.254.242.180])
by mail.destination.com (Postfix) with ESMTPS id 31A1B66
for <[email protected]>; Thu, 4 Dec 2014 21:00:36 +0100 (CET)
Received: from [192.168.1.113] (unknown [12.34.56.78])
by mail.origin.com (Postfix) with ESMTPSA id 08AE908
for <[email protected]>; Thu, 4 Dec 2014 21:00:36 +0100 (CET)
Is it possible to disable this, or would that constitute "breaking
standards" ?
Is there any use in exposing my laptop IP address?
PS: I understand that in the above example, 192.168.1.113 is a
non-routable IP. But it could be any IP, depending on the client.
thanks,
Martin
A few weeks back I was also surprised to see that the client IP was
being sent out in the headers. Two options that I found in my research:
#1) Enabling the "smtpd_sasl_authenticated_header" option and using
header_checks to remove that header (which if I am not mistaken checks
all email).
http://moblog.wiredwings.com/archives/20100501/remove-ips-from-outgoing-mail-postfix-smtp.html
#2) Creating a new service in master.cf that you hook up to your
submission (or otherwise authenticated) service and use header checks to
search/replace against your client info as shown here:
https://major.io/2013/04/14/remove-sensitive-information-from-email-headers-with-postfix/#comment-63131
That approach appears to be cleaner/more efficient as it should only
touch mail sent by authenticated users and not all email.
I went with option #2 about a month ago and so far so good.
