On Fri, Oct 22, 2010 at 3:34 PM, Ralf Hildebrandt
<ralf.hildebra...@charite.de> wrote:
> Ah, maybe they're looking at all the headers, which is really stupid!

Oh so then this is completely something configured wrong on their end
using Microsoft Exchange, right? I just sent email from the same IP to
my personal and friends Postfix mail servers who both use RBL checks
to zen.spamhaus.org and they passed through fine.

Can I ask what the normal procedure is for mail? If the latter IP is
listed on a PBL but the last received IP is not, does it then allow?
Does Postfix only look at the the most recent received client IP for
RBL checks and thats all?

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