I am trying to find a solution for filtering the first-senders ip/host information out of an email header. (I am running mailman with postfix).
The very first? E.g. the IP of the dialup the user is sending from?
I am already doing the anonymization when sending mail for "normal" users by setting smtpd_sasl_authenticated_header=yes and then using header_checks to replace the part of the header where the users ip address can be found with 127.0.0.1.
OK. Why not do the same for the other users?
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