Alex via Postfix-users:
> Hi,
>
> > > > > internet -> front-end Postfix instance -> filter -> back-end
> > > > Postfix
> > > > > > instance
> > > > > >
> > > > > > The front-end Postfix instance uses transport_maps to select a
> > suitable
> > > > > > filter.
> > > > > >
> > > > > > example.com: smtp:<filter-for-example-com>
> > > > > > example.org: smtp:<filter-for-example-ord>
> > > > > >
> > > > > > Each filter then delivers to the back-end Postfix.
> > > > >
> > > > > This implies one IP per domain as well, correct?
> > > >
> > > > No. One front-end instance can receive mail for N domains, and they
> > > > can share (MX) IP addresses.
> > > >
> > > > You can have multiple front ends, again that is not required for
> > > > per-domain filters to work.
> > >
> > > I'm starting to understand and really appreciate your help. Can I ask you
> > > to provide me with an example of what you mean? Are you referring to
> > what's
> >
> > That is shown above, expressed in terms of transport maps and
> > customized content filters in-between general-purpose Postfix
> > instances.
> >
> > header/body checks don't generalize beyond narrow use cases.
> >
>
> I'm trying really hard, but I just don't understand what you mean. I set up
> multi-instance with Viktor's help some time ago, where each instance
> essentially processes mail for a somewhat related group of domains. Adding
> transport maps to the front-end instance would be different than what I
> remember doing with Viktor.
>
> I don't have any content filters set up in the front-end postfix. How do I
> connect the front-end postfix with the filters?
>
> I think this is something I can implement, but I need more of a description
> of how it should work, please.
According to the subject, you appear to be looking for per-domain
header/body check. That is not the right tool, and I would not
spend my cycles on a design for that.
Instead I recommend filters between a front and back-end instance,
using transport_maps to select a filter depending on the domain.
I recall that you are familiar with Amavis as a content filter.
That would be a better tool for the job. Each domain can then have
its own Amavis config that receives mail on its own port.
Wietse
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