On Tue, Jul 15, 2025 at 10:49:56AM -0400, Wietse Venema via Postfix-users wrote:
> > Perhaps an example, like the above, that puts multiple pieces of the
> > puzzle together could make a useful addition to ADDRESS_REWRITING_README?
>
> I've been collecting 'advanced' examples. They could be located based
> on affinity with existing text, or grouped in a separate docuemnt
> if they touch on many features.
>
> This example may fall in either category. With input rewriting,
> transport mapping, and output rewriting it's all address rewriting.
> But it is also DKIM and SPF safe, because this clever design is
> unlikely to modify headers.
Well, DKIM-safe anyway. For SPF safety we'd also need an envelope
sender rewrite. IIRC BCC recipients do not get an automatic <> null
envelope sender, rather only DSN NOTIFY=NONE is used to discourage
bounces, ... (This is in part needed because otherwise some downstream
systems may reject "multi-recipient bounces" when they see many
recipients sharing a null sender).
--
Viktor. 🇺🇦 Слава Україні!
_______________________________________________
Postfix-users mailing list -- postfix-users@postfix.org
To unsubscribe send an email to postfix-users-le...@postfix.org
