Received-header with dyn-ip problem Hello list!

I have a postfix-setup that rely from wherever to wherever for
authenticated users. However, since postfix add headers like
Received: from [192.168.100.200] (dsl.example.com [1.2.3.4])
spamassassin add points for dynamic ip (RDNS_DYNAMIC), e.g. when the
user is at her home with an adsl-connection.

Users can only authenticate themselves at a second, smtp-over-ssl,
instance with auth required.

What would be the best solution to get around this (the
spamassassin-score). Most obvious for me would be to have postfix lie
about in the first receive-header for authenticated users, but I don't
know if that is possible.

Can someone advise on how to solve this problem?

Best regards


