Heiko Schlittermann <[email protected]> (Di 13 Mai 2014 12:38:15 CEST):
> Heiko Schlittermann <[email protected]> (Di 13 Mai 2014 12:29:44 CEST):
> …
> > 
> > I'd say, the only way is comparing the complete message (header and
> > body). I can imagine some kind of ratelimit, based on the hash of the
> > message headers and body. Maybe some shortcut can be to use only the
> > complete message headers.
> > 
> > I'd try to use some ratelimit keyed on the messages body.
> 
> I ment the message headers, because the body isn't fully available
> (except your rise message_body_visible main variable to provide enough
> space.)
> 
> On the other hand, the $message_headers isn't very helpful at the DATA
> ACL, since the received headers are added already, and they contain
> timestamps. Thus - a bit more work is necessary…

May be something like this could do:

    acl_check_data:

        deny    message = duplicate ($sender_rate)
                ratelimit = 
1.1/1000w/strict/${sha1:$h_date:$h_subject:$h_message_id:}
        accept


The list of headers should be adapted to your idea about what 
is a dup.

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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