From: mouss (usebsdfree.fr)
Date: Wed Nov 01 2006 - 07:03:36 CST

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nickjavacat.f2s.com wrote:
> Quoting Sandy Drobic <postfix-usersjapantest.homelinux.com>:
>
>
>> nickjavacat.f2s.com wrote:
>>
>>> Hi,
>>>
>>> Im looking to prepend [SPAM] to the Subject: of mails that come in with a preassigned X-SpamReason: value of 1..4.
>>>
>>> main.cf:header_checks = pcre:/etc/postfix/header_checks
>>>
>>> And in header_checks:
>>> /X-SpamReason: Yes, hits=([1..4]\.[0-9]*).*required/ PREPEND Subject: [SPAM]
>>>
>>> However this is overwriting the Subject completely, and Im just getting [SPAM] in the Subject of the mail
>>> once its received.
>>>
>>> Any idea what I could be doing wrong ?
>>>
>> Prepend sets a new Subject header here. This is better done by your filter
>> software. Header_checks can't set a subject header in relation to another
>> check on x-spamreason.
>>
>> You either need a filter for that or do it directly in your spamfilter.
>>
>
> I see, thanks for the explanation.
>

you can use procmail|maildrop with formail|reformail.

it is possible to with postfix but that would be overkill (run a
specific smtpd as a content_filter, using the FILTER statement in place
of your PREPEND. then that smtpd will have its own cleanup to modify the
subject).

That said, subject rewrite is more or less ugly. sometimes, a site
misclassifies a message and tag the subject, then the recipient replies
to forwards it... I already seen customer requests with a spam tag in
the subject! fortunately, I don't rely on the subject...

An alternative is to prepend specific headers. For recipients using
imap, you can deliver to a Junk folder. Pop users can set filters on
their MUAs based on the headers you prepend.

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