Hello!
First time caller, long time listener :).
I've been working on a new mail filtering solution for our company that
revolves around the solution receiving inbound mail through a load balancer.
We have come upon an issue that I am not finding any sort of documentation or
notes that others have experienced..
We are using a load balancer behind a nat, that distributes the inbound emails
to a clustered mail scanning solution (we have been having issues with our
current solution where the existing servers are overloaded, and this gives us
the ability to plug and play new servers with zero dns adjustments..) Now, our
load balancers hands off the message to the first available postfix server, we
get headers that look like the following (after postfix picks it up).
--
Received: from batch.email.flyfrontier.com (edge1.dc1.domain.com [172.16.4.#])
by mta02.dc1.domain.com (Postfix) with ESMTP id ###########
for <[email protected]>; Wed, 7 Jan 2015 10:48:52 -0600 (CST)
--
The issue, if you don't see it, is that postfix seems to be using the load
balancer ip as the last hop, and because the load balancer is just pushing
content through it is not recording the previous hop to the headers, which is
causing some issues..
I have looked at the proxy protocol settings, as well as the XCLIENT options, I
was just wondering if anyone had any success using the re-writing options
within postfix to fix the received header before it gets processed by the
scanners/grey list check?
Our load balancer might be able to rewrite the headers, but I have to assume
that these are written based on the way that postfix is receiving the email,
from the load balancer node instead of ignoring the node and just using the
previous hop for this purpose.
Not being able to see the last true hop is causing issues with the scanning
software and I've been racking my brain the last few days trying to figure out
how to make this work properly..
Any advice would be greatly appreciated!
Brad Riemann
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