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.
Wietse
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