I am trying to write some rules for filtering email with postfix header
rules. In particular, I'd like to discard anything in a character set I
don't understand, or rather accept ascii, iso-8859-* and utf-8.
So I have created the following rule for mime header checks:
WARN MHD1000 Invalid charset: "$1". Use UTF-8 or ISO-8859-X
I have two problems:
First: This rule catches a lot of legitimate mail, ascii or iso
Secondly: I'd like to catch the character set that is rejected so I can
adjust it if legitimate mail gets blocked. In the above I don't allow
windows-1252 for example.
So, how do I do negative look ahead with capturing using pcre?
Ph: +34.666334818 web: www.locolomo.org
S/MIME Certificate: www.daemonsecurity.com/ca/8D03551FFCE04F06.crt
Subject ID: 9E:AA:18:E6:94:7A:91:44:0A:E4:DD:87:73:7F:4E:82:E7:08:9C:72
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