From: Noel Jones (njonesmegan.vbhcs.org)
Date: Mon Jan 01 2007 - 11:47:21 CST

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At 10:52 AM 1/1/2007, Crayon wrote:
>Hi
>
>I'm new to postfix (having used qmail for several years). In my old setup
>I had maildrop rules that are run on addresses which I use to receive
>mailing lists. So for example, for an address that is used solely for
>receiving this list, the maildrop rules would check for the presence of
>these headers:
>
> Sender: owner-postfix-userspostfix.org
> Precedence: bulk
> List-Post: <mailto:postfix-userspostfix.org>
> List-Help: <http://www.postfix.org/lists.html>
> List-Unsubscribe: <mailto:majordomopostfix.org>
> List-Subscribe: <mailto:majordomopostfix.org>
>
>If the check fails the mail is unlikely to have come from the list and is
>most likely spam (or a direct reply from someone on the list - which I
>don't want) and gets rejected.
>
>What I would like to know is, can something similar be implemented using
>postfix's header_checks? My reading of the docs suggests it can't be done
>because postfix only processes a single header at a time and makes a
>decision per header.

header_checks doesn't keep state between lines, so it can't check for
multiple conditions as your example
above. Maildrop/procmail/SpamAssassin or similar are well suited for
this task.

>Another thing is I would like to reject mails don't have a "Subject:"
>header (or it is empty). Again, because of the way the header_checks are
>done I don't think I can check for the absence of a particular header?

Header_checks can detect an empty header, something like:
/^subject: *$/ REJECT empty subject header
(btw, the above is likely to reject legit mail) but header_checks
cannot detect a missing header. Again,
maildrop/procmail/SpamAssassin etc. can handle that task.

--
Noel Jones

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