On Sat, Apr 19, 2025 at 12:13:52PM +0200, Matus UHLAR - fantomas via
Postfix-users wrote:
> On 18.04.25 22:00, Dmytro Alieksieiev via Postfix-users wrote:
> > So you say it's better to do recipient_canonical_maps on incoming mail?
> > How it will improve situation? SRS will still throw same error and
> > Postfix still reply with 4xx, no?
>
> canonical_maps apply when postfix receives mail.
>
> Using recipient_canonical_maps on postfix instance that receives mail from
> the internet is fine - this way you can check for valid SRS address when
> receiving and can immediately refuse that mail.
I recommend against "recipient_canonical_maps", it rewrites a subset of
the message headers, (To/Cc or Resent-To/Resent-Cc), while in almost all
cases one should really rewrite all address-valued headers or none.
To rewrite envelope recipients, use "virtual_aliases", not
"recipient_canonical_maps".
> Using sender_canonical_maps is better when you send mail to the
> internet, e.g. forward it - so mail recveived from internet will not
> have sender rewritten, but any mail forwarded from your system with
> remote sender address will.
There is no dedicated equivaelnt mechanism to rewrite just envelope
senders on input, but the combination of:
sender_canonical_classes = envelope_sender
sender_canonical_maps = ...
is close enough. For header rewriting, use "canonical_maps", which
consistently rewrites all headers.
--
Viktor.
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