On Fri, 03 May 2002, Craig Sanders wrote:

> On Fri, May 03, 2002 at 02:53:47PM +1000, Matthew Hawkins wrote:
> > header and body checks are done by cleanup, not smtpd, so the advantage
> > is already defeated [*].
>
> why say things you know are untrue?

Quoting cleanup(8)

CONFIGURATION PARAMETERS
       The following main.cf parameters are especially relevant
       to this program. See the Postfix main.cf file for syntax
       details and for default values. Use the postfix reload
       command after a configuration change.

Content filtering
       body_checks
              Lookup tables with content filters for message body
              lines. These filters see physical lines one at a
              time, in chunks of at most line_length_limit bytes.

       header_checks
              Lookup tables with content filters for message
              header lines. These filters see logical headers
              one at a time, including headers that span multiple
              lines.

Quoting Wietse Venema, Message-Id: <20020402200255.A4D09BC06Fspike.porcupine.org>
on Date: Tue, 2 Apr 2002 15:02:55 -0500 (EST)

"The cleanup server is used by a lot of Postfix components: the
local delivery agent (when forwarding mail), the bounce/defer daemon
(when sending a non-delivery notification via email), and in the
smtp/smtpd/lmtp processes (when sending postmaster notifications).
And there may be more.
                                                                                                              
However, what is artificial is that header/body checks are done in
the cleanup server instead of smtpd. That was a combination of
convenience (header recognizing code was already in place) and
consistency (it also examines mail that arrives via a non-SMTP
channel such as /usr/sbin/sendmail, QMQP, or otherwise)."

http://www.postfix.org/big-picture.html

(Just to name 3 references to back up my claims that header/body checks
are done by cleanup, and that cleanup is called by smtpd)

> you misinterpret me. i never said that was a good or desirable thing.
> i was pointing out that it was a step backwards.

Sorry, I took the "you may as well.." along with the fact you'd done it
previously yourself, as an advocation and so named a very real instance
where it doesn't apply.

> your suggestion was to receive the mail without body/header checks then,
> depending upon recipient address, re-inject it back into postfix with
> header/body checks enabled.

My suggestion was simply to use this feature of snapshot 20020331:

        Choice between multiple instances of internal services: bounce,
        cleanup, defer, error, flush, pickup, queue, rewrite, showq. This
        allows you to use different cleanup server settings for different
        SMTP server instances. For example, specify in the master.cf file:
                                                                                                              
            localhost:10025 ... smtpd -o cleanup_service_name=cleanup2 ...
            cleanup2 ... cleanup -o header_checks= body_checks= ...

to achieve optional application of header/body checks without having to
resort to any external filters. It's the only way I know of that you
can have header_checks and/or body_checks be applied selectively from
the one Postfix instance.

Granted, its new and relatively unexplored territory.

-- 
Matt
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