From: Carlos Jiménez (zuberoteleline.es)
Date: Wed Jan 02 2008 - 15:12:18 CST

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Hello, everybody:

I have two server with Postfix running as a Mail Gateway with antispam
filtering. These two computers are connected to a load balancer (hardware
appliance). Unfortunately, this device receives all SMTP traffic and
modifies IP value of the sender with its own (load balancer IP). We have
configured a filtering based on RBL’s, but it doesn’t work because this IP
address is a valid one.

We should use RBL’s based on domain name, but would it be possible to
configure Postfix to skip the IP of the load balancer and just filtering the
IP of the original sender?

If it is not possible, do you know an efficient way to bypass this issue?

We are now using RBL’s, but we’d like later to implement GreyListing and a
few filters based on sender IP.

Thank you in advance.

Carlos.

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