On 3 May 2002, Ralf Hildebrandt <Ralf.Hildebrandtcharite.de> wrote:
> On Fri, May 03, 2002 at 04:48:57PM +1000, Craig Sanders wrote:
>
> > > My suggestion was simply to use this feature of snapshot 20020331:
> >
> > and as i said, i pointed out that doing this would probably have
> > undesirable consequences. if you accept a message and then test
> > whether
>
> No. It's still in the SMTP dialogue, but during the DATA phase. If one
> still rejects during that phase, the receiving machine need not (and
> cannot!) create a bounce.

    I believe the approach suggested here goes something like this:

(1) the default cleanup does no header or body checks --- otherwise
    the checks would be applied regardless of their recipients;

(2) a recipient_canonical map rewrites the addresses of the "spam
    haters" to some dummy host:

        jdoeexample.com jdoedummy.example.com

(3) a transport map routes messages addresses to the dummy host to a
    second smtpd listening on localhost:

        dummy.example.com smtp:localhost:10025

    (one might be able to merge (2) and (3) once per-user transport
    tables are available);

(4) the second smtpd uses a cleanup with full header and body checks:

        localhost:10025 ... smtpd -o cleanup_service_name=cleanup2 ...
        cleanup2 ... cleanup -o body_checks=/some/file ...

(5) the second cleanup would also rewrite the addresses of "spam haters"
    back to their original values.

    Rejection of a message because of header or body checks would happen
in the second SMTP dialogue, and thus local Postfix would get the
pleasure of sending a bounce.

    Regards,

    Liviu Daia

-- 
Dr. Liviu Daia               e-mail:   Liviu.Daiaimar.ro
Institute of Mathematics     web page: http://www.imar.ro/~daia
of the Romanian Academy      PGP key:  http://www.imar.ro/~daia/daia.asc
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