DAVID HASSILEV:
>
> Thank your for the reply. While I am not too familiar (yet) with the Policy
> Daemons, it seems somewhat straight forward. What I do not understand in
> your suggestion is the multiple smtp_bind_address statements. It's not clear
> to me how that will effect delivery to separate smarthosts or relay hosts.
> We forward ALL mail to a relayhost owned by us, but via two different (one
> public and one private) routes.
OK, if you're doing cost-dependent smarthost selection, then you
don't need smtp_bind_address statements.
Instead, the policy daemon would reply with one of the following:
FILTER smtp:[smarthost1]
FILTER smtp:[smarthost2]
DUNNO
Also, no tweaking would be necessary at the routing level.
Wietse
> I do not wish to have multiple default routes to the outside, rather, I am
> only trying to force smtpd to deliver either via the relay host A or relay
> host B based on email size.
>
> I understand that I can force all non-local mail to deliver via
> relayhost=[a.some.domain] and alternatively
> smtp_fallback_relay=[b.some.domain].
>
> I guess I'm still trying to determine whether I can force mail by size
> restriction via one relayhost or another. If this is done with the
> smtp_bind_address I guess I have much more reading to do.
>
> Hopefully that made sense.
>
> Regards,
> -David
>
>
> > From: Wietse Venema <wie...@porcupine.org>
> > Reply-To: Postfix users <postfix-users@postfix.org>
> > Date: Mon, 25 Jan 2010 14:57:32 -0500 (EST)
> > To: Postfix users <postfix-users@postfix.org>
> > Subject: Re: Cost based routing
> >
> > DAVID HASSILEV:
> >>
> >> Hello, I have tried to search through the list archives but have not found
> >> what I'm looking for so I thought I'd post to the list.
> >
> > To implement routing policies depending on message size,
> >
> > - Implement a Postfix policy daemon to examine the message size
> > attribute (invoked from smtpd_end_of_data_restrictions).
> > See:
> > http://www.postfix.org/SMTPD_POLICY_README.html
> > http://www.postfix.org/postconf.5.html#smtpd_end_of_data_restrictions
> > http://www.postfix.org/postconf.5.html#check_policy_service
> >
> > - Have the policy daemon respond with "FILTER A:" or "FILTER B:"
> > or "dunno". A and B are the names of smtp client entries in
> > master.cf, each with their own "-o smtp_bind_address=xxx" option.
> > See:
> > http://www.postfix.org/master.5.html (for "-o name=value)
> > http://www.postfix.org/postconf.5.html#smtp_bind_address
> >
> > This requires Postfix 2.7 snapshot 20100117 (or later). To make
> > this work you will also have to tweak the network stack to support
> > two "default" routes to the outside world. I can tell you only the
> > Postfix side.
> >
> > Wietse
> >
>
>
>
>
