Alex via Postfix-users:
> Hi,
>
> On Sun, May 21, 2023 at 4:41?PM Wietse Venema via Postfix-users <
> postfix-users@postfix.org> wrote:
>
> > Alex via Postfix-users:
> > > > > I'd say, start with one instance per domain. The 'cost' of doing so
> > > > > is really small.
> > > >
> > > > Once you run out of IP addresses, you will need policy selection
> > > > based on the recipient domain. For example:
> > > >
> > > > 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.
Wietse
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