On Sep 21, 2013, at 14:53, Jan P. Kessler <post...@jpkessler.info> wrote:

>> The way I read his request is that he wants to forward non-spam
>> only, and is looking for a Postfix solution that supports this.
>> 
>> The best proposal I can come up with is a Milter that triggers on
>> headers added by has spam filter, and that adds a second
>> recipient only if the mail does not appear to be spam.
> 
> Not the best but maybe another option, if you can't find/write a milter:
> 
> Set up a 2nd postfix instance that acts as relayhost for the first.
> There you could discard or redirect unwanted messages with
> header_checks. One possible disadvantage is that this would happen for
> *any* outgoing mail (not only the forwarded ones).

Would the single, existing instance with 'smtp_header_checks' not 
achieve the same thing?

http://www.postfix.org/postconf.5.html#smtp_header_checks

Mvg,
Joni

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